Results for 'Quantum cosmology'

1000+ found
Order:
  1. Consistent Histories in Quantum Cosmology.David Craig & Parampreet Singh - 2011 - Foundations of Physics 41 (3):371-379.
    We illustrate the crucial role played by decoherence (consistency of quantum histories) in extracting consistent quantum probabilities for alternative histories in quantum cosmology. Specifically, within a Wheeler-DeWitt quantization of a flat Friedmann-Robertson-Walker cosmological model sourced with a free massless scalar field, we calculate the probability that the universe is singular in the sense that it assumes zero volume. Classical solutions of this model are a disjoint set of expanding and contracting singular branches. A naive assessment of (...)
    Direct download (4 more)  
     
    Export citation  
     
    Bookmark   2 citations  
  2. Less Interpretation and More Decoherence in Quantum Gravity and Inflationary Cosmology.Elise M. Crull - 2015 - Foundations of Physics 45 (9):1019-1045.
    I argue that quantum decoherence—understood as a dynamical process entailed by the standard formalism alone—carries us beyond conceptual aspects of non-relativistic quantum mechanics deemed insurmountable by many contributors to the recent quantum gravity and cosmology literature. These aspects include various incarnations of the measurement problem and of the quantum -to-classical puzzle. Not only can such problems be largely bypassed or dissolved without default to a particular interpretation, but theoretical work in relativistic arenas stands to gain (...)
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark   6 citations  
  3.  65
    Less Decoherence and More Coherence in Quantum Gravity, Inflationary Cosmology and Elsewhere.Elias Okon & Daniel Sudarsky - 2016 - Foundations of Physics 46 (7):852-879.
    In Crull it is argued that, in order to confront outstanding problems in cosmology and quantum gravity, interpretational aspects of quantum theory can by bypassed because decoherence is able to resolve them. As a result, Crull concludes that our focus on conceptual and interpretational issues, while dealing with such matters in Okon and Sudarsky, is avoidable and even pernicious. Here we will defend our position by showing in detail why decoherence does not help in the resolution of (...)
    Direct download (7 more)  
     
    Export citation  
     
    Bookmark   5 citations  
  4. On the Argument From Quantum Cosmology Against Theism.Ned Markosian - 1995 - Analysis 55 (4):247 - 251.
    In a recent Analysis article, Quentin Smith argues that classical theism is inconsistent with certain consequences of Stephen Hawking's quantum cosmology.1 Although I am not a theist, it seems to me that Smith's argument fails to establish its conclusion. The purpose of this paper is to show what is wrong with Smith's argument. According to Smith, Hawking's cosmological theory includes what Smith calls "Hawking's wave function law." Hawking's wave function law (hereafter, "HL") apparently has, among its consequences, the (...)
    Direct download (5 more)  
     
    Export citation  
     
    Bookmark   1 citation  
  5. The Loss of Coherence in Quantum Cosmology.Katinka Ridderbos - 1999 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 30 (1):41-60.
    I analyse two different methods for the retrieval of a classical notion of spacetime from the theory of quantum cosmology in terms of the different means they employ to bring about the necessary loss of coherence. One method employs a direct coarse graining of the appropriate phase space, whereas the other method is based on decohering the system by the interaction with an environment. Although these methods are equivalent on a phenomenological level, I argue that conceptually the decoherence (...)
    Direct download (4 more)  
     
    Export citation  
     
    Bookmark   3 citations  
  6.  71
    The Bohmian Model of Quantum Cosmology.Craig Callender & Robert Weingard - 1994 - PSA: Proceedings of the Biennial Meeting of the Philosophy of Science Association 1994:218 - 227.
    A realist causal model of quantum cosmology (QC) is developed. By applying the de Broglie-Bohm interpretation of quantum mechanics to QC, we resolve the notorious 'problem of time' in QC, and derive exact equations of motion for cosmological dynamical variables. Due to this success, it is argued that if the situation in QC is used as a yardstick by which other interpretations are measured, the de Broglie-Bohm theory seems uniquely fit as an interpretation of quantum mechanics.
    Direct download  
     
    Export citation  
     
    Bookmark   6 citations  
  7. The Bohm Interpretation of Quantum Cosmology.Nelson Pinto-Neto - 2005 - Foundations of Physics 35 (4):577-603.
    I make a review on the aplications of the Bohm-de Broglie interpretation of quantum mechanics to quantum cosmology. In the framework of minisuperspaces models, I show how quantum cosmological effects in Bohm’s view can avoid the initial singularity, and isotropize the Universe. In the general case, I enumerate the possible structures of quantum space and time.
    Direct download (10 more)  
     
    Export citation  
     
    Bookmark  
  8.  3
    The Loss of Coherence in Quantum Cosmology.Katinka Ridderbos - 1998 - Studies in History and Philosophy of Modern Physics 30 (1):41-60.
    I analyse two different methods for the retrieval of a classical notion of spacetime from the theory of quantum cosmology in terms of the different means they employ to bring about the necessary loss of coherence. One method employs a direct coarse graining of the appropriate phase space, whereas the other method is based on decohering the system by the interaction with an environment. Although these methods are equivalent on a phenomenological level, I argue that conceptually the decoherence (...)
    Direct download  
     
    Export citation  
     
    Bookmark   2 citations  
  9.  22
    Ψ-Epistemic Quantum Cosmology?Peter W. Evans, Sean Gryb & Karim P. Y. Thébault - 2016 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 56:1-12.
    This paper provides a prospectus for a new way of thinking about the wavefunction of the universe: a Ψ-epistemic quantum cosmology. We present a proposal that, if successfully implemented, would resolve the cosmological measurement problem and simultaneously allow us to think sensibly about probability and evolution in quantum cosmology. Our analysis draws upon recent work on the problem of time in quantum gravity and causally symmet- ric local hidden variable theories. Our conclusion weighs the strengths (...)
    Direct download (9 more)  
     
    Export citation  
     
    Bookmark  
  10. The Unconscious Quantum: Metaphysics in Modern Physics and Cosmology.Victor J. Stenger - 1995 - Prometheus Books.
    In this fascinating and accessible book, physicist Victor J. Stenger guides the lay reader through the key developments of quantum mechanics and the debate over its apparent paradoxes. In the process, he critically appraises recent metaphysical fads. Dr. Stenger's knack for elucidating scientific ideas and controversies in language that the nonspecialist can comprehend opens up to the widest possible audience a wealth of information on the most important findings of contemporary physics.
     
    Export citation  
     
    Bookmark   5 citations  
  11. Quantum Gravity and Taoist Cosmology: Exploring the Ancient Origins of Phenomenological String Theory.Steven M. Rosen - 2017 - Progress in Biophysics and Molecular Biology 131:34-60.
    In the author’s previous contribution to this journal (Rosen 2015), a phenomenological string theory was proposed based on qualitative topology and hypercomplex numbers. The current paper takes this further by delving into the ancient Chinese origin of phenomenological string theory. First, we discover a connection between the Klein bottle, which is crucial to the theory, and the Ho-t’u, a Chinese number archetype central to Taoist cosmology. The two structures are seen to mirror each other in expressing the psychophysical (phenomenological) (...)
    Direct download  
     
    Export citation  
     
    Bookmark  
  12. Quantum Cosmology and Theism: A Reply to Quentin Smith.Daniel Murphy - 2008 - Philo 11 (1):93-119.
    Quentin Smith has argued that quantum-cosmological theory is incompatible with theism. The two claims that Smith argues render theism inconsistent with Hawking’s theory are that of the initial creation of the universe by God and His continued conservation of it. His primary argument is that divine decision and Hawking’s wave function entail contradictory probabilities that the universe begin to exist and continue to evolve in a certain way. I attempt to refute the argument by providing a schema that accommodates (...)
    Direct download (4 more)  
     
    Export citation  
     
    Bookmark  
  13. Arguments From Nothing: God and Quantum Cosmology.Lawrence Cahoone - 2009 - Zygon 44 (4):777-796.
    This essay explores a simple argument for a Ground of Being, objections to it, and limitations on it. It is nonsensical to refer to Nothing in the sense of utter absence, hence nothing can be claimed to come from Nothing. If, as it seems, the universe, or any physical ensemble containing it, is past-finite, it must be caused by an uncaused Ground. Speculative many-worlds, pocket universes and multiverses do not affect this argument, but the quantum cosmologies of Alex Vilenkin, (...)
    Direct download (4 more)  
     
    Export citation  
     
    Bookmark   2 citations  
  14.  62
    Time, Bohm's Theory, and Quantum Cosmology.Craig Callender & Robert Weingard - 1996 - Philosophy of Science 63 (3):470-474.
    Onc of thc problems of quantnun cosmology follows from thc fact that thc Hamiltonian H of classical general relativity equals zero. Quantizing canonically in thc Schrodinger picture, thc Schrodinger equation for thc wave function *1* of thc universe is thcreforc thc so-called Whcelc:r—DeWitt..
    Direct download (7 more)  
     
    Export citation  
     
    Bookmark   5 citations  
  15. Quantum Cosmology and the Beginning of the Universe.Gerrit Smith & Robert Weingard - 1990 - Philosophy of Science 57 (4):663-667.
    In this note a recently developed quantum oscillating finite space cosmological model is described. The principle novelty of the model is that there is a quantum blurring of the classical singularity between cycles, instead of a singularity free bounce. Recently, Quentin Smith (1988) has argued that present theoretical and observational evidence justifies the belief that the past history of the universe is finite. The relevance of this cosmological model to Smith's arguments is discussed.
    Direct download (6 more)  
     
    Export citation  
     
    Bookmark   2 citations  
  16. Quantum Cosmology, Theistic Philosophical Cosmology and the Existence Question.George Nakhnikian - 2000 - Philo 3 (1):63-72.
    In a recent essay, Quentin Smith revisits a question of philosophical cosmology. Why does the universe exist? This is one way of asking the existence question EQ. Smith notes that all theistic philosophical cosmologists have answered this question in terms of God’s creative choice. Smith favors an “atheistic” philosophical answer: “The universe exists because it has an unconditional probability of existing based on a fundamental law of nature.” He further declares: “This law of nature... is inconsistent with theism and (...)
    Direct download (4 more)  
     
    Export citation  
     
    Bookmark  
  17.  22
    The Many-Worlds Interpretation of Quantum Mechanics in Quantum Cosmology.Frank J. Tipler - 1986 - In Roger Penrose & C. J. Isham (eds.), Quantum Concepts in Space and Time. New York ;Oxford University Press. pp. 1--204.
  18.  23
    The Wheeler-DeWitt Equation and the Path Integral in Minisuperspace Quantum Cosmology.J. J. Halliwell - 1991 - In A. Ashtekar & J. Stachel (eds.), Conceptual Problems of Quantum Gravity. Birkhauser. pp. 1--75.
    Direct download  
     
    Export citation  
     
    Bookmark  
  19.  2
    Time in Quantum Cosmology.J. J. Halliwell - 1991 - In A. Ashtekar & J. Stachel (eds.), Conceptual Problems of Quantum Gravity. Birkhauser. pp. 1--204.
  20.  5
    Time and Prediction in Quantum Cosmology.James B. Hartle - 1991 - In A. Ashtekar & J. Stachel (eds.), Conceptual Problems of Quantum Gravity. Birkhauser. pp. 1--172.
    Direct download  
     
    Export citation  
     
    Bookmark  
  21.  23
    Interpreting the Quantum Mechanics of Cosmology.David Wallace - forthcoming - In A. Ijjas & B. Loewer (eds.), Philosophy of Cosmology: an Introduction. Oxford University Press.
    Quantum theory plays an increasingly significant role in contemporary early-universe cosmology, most notably in the inflationary origins of the fluctuation spectrum of the microwave background radiation. I consider the two main strategies for interpreting standard quantum mechanics in the light of cosmology. I argue that the conceptual difficulties of the approaches based around an irreducible role for measurement - already very severe - become intolerable in a cosmological context, whereas the approach based around Everett's original idea (...)
    No categories
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark   3 citations  
  22. Quantum Cosmology and the Laws of Nature: Scientific Perspectives on Divine Action.R. J. Russell, N. Murphy & C. J. Isham (eds.) - 1993 - Vatican Observatory.
  23. Quantum Cosmology's Implication of Atheism.Q. Smith - 1997 - Analysis 57 (4):295-304.
  24. Dalszy Ciąg Ważnej Debaty [Recenzja] Quantum Cosmology and the Laws of Nature - Scientific Perspectives on Divine Action, Red.: R.J. Russel, N. Murphy, C. J. Isham, 1993. [REVIEW]Michał Heller - 1994 - Zagadnienia Filozoficzne W Nauce 16.
  25. The Structure and Interpretation of Cosmology: Part II. The Concept of Creation in Inflation and Quantum Cosmology.Gordon McCabe - 2005 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 36 (1):67-102.
  26.  8
    The Loss of Coherence in Quantum Cosmology.Katinka Ridderbos - 1999 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 30 (1):41-60.
  27.  55
    Quantum Cosmology and the Hard Problem of the Conscious Brain.Chris King - 2006 - In J. Tuszynski (ed.), The Emerging Physics of Consciousness. Springer Verlag. pp. 407--456.
  28.  10
    The Thermodynamic Arrow of Time in Quantum Cosmology.Katinka Ridderbos - 2003 - In A. Rojszczak, J. Cachro & G. Kurczewski (eds.), Philosophical Dimensions of Logic and Science. Kluwer Academic Publishers. pp. 179--194.
  29.  4
    The Structure and Interpretation of Cosmology: Part II. The Concept of Creation in Inflation and Quantum Cosmology.Gordon McCabe - 2005 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 36 (1):67-102.
  30.  9
    On the Argument From Quantum Cosmology Against Theism.N. Markosian - 1995 - Analysis 55 (4):247-251.
  31.  8
    Superpositions of the Cosmological Constant Allow for Singularity Resolution and Unitary Evolution in Quantum Cosmology.Sean Gryb & Karim P. Y. Thebault - unknown
    A novel approach to quantization is shown to allow for superpositions of the cosmological constant in isotropic and homogeneous mini-superspace models. Generic solutions featuring such superpositions display: i) a unitary evolution equation; ii) singularity resolution; iii) a cosmic bounce. Explicit cosmological solutions are constructed. These exhibit characteristic bounce features including a ‘super-inflation’ regime with universal phenomenology that can naturally be made to be insensitive to Planck-scale physics.
    No categories
    Direct download (4 more)  
     
    Export citation  
     
    Bookmark  
  32.  33
    Interpretations of Quantum Theory in the Light of Modern Cosmology.Mario Castagnino, Sebastian Fortin, Roberto Laura & Daniel Sudarsky - 2017 - Foundations of Physics 47 (11):1387-1422.
    The difficult issues related to the interpretation of quantum mechanics and, in particular, the “measurement problem” are revisited using as motivation the process of generation of structure from quantum fluctuations in inflationary cosmology. The unessential mathematical complexity of the particular problem is bypassed, facilitating the discussion of the conceptual issues, by considering, within the paradigm set up by the cosmological problem, another problem where symmetry serves as a focal point: a simplified version of Mott’s problem.
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark  
  33. Quantum Vacuum Noise in Physics and Cosmology.Paul Davies - manuscript
    The concept of the vacuum in quantum field theory is a subtle one. Vacuum states have a rich and complex set of properties that produce distinctive, though usually exceedingly small, physical effects. Quantum vacuum noise is familiar in optical and electronic devices, but in this paper I wish to consider extending the discussion to systems in which gravitation, or large accelerations, are important. This leads to the prediction of vacuum friction: The quantum vacuum can act in a (...)
     
    Export citation  
     
    Bookmark   1 citation  
  34.  57
    On Methodological Problems in Cosmology and Quantum Gravity.Alexander D. Panov - 2010 - Russian Studies in Philosophy 49 (3):72-92.
    The author demonstrates that researchers in quantum physics and inflationary cosmology have in practice loosened the rigorous traditional principles of scientific methodology . He formulates some principles of the new methodology.
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark  
  35.  8
    Local and Global Definitions of Time: Cosmology and Quantum Theory.William Nelson - unknown
    I will give a broad overview of what has become the standard paradigm in cosmology. I will describe the relational notion of time that is often used in cosmological calculations and discuss how the local nature of Einstein's equations allows us to translate this notion into statements about `initial' data. Classically this relates our local definition of time to a quasi-local region of a particular spatial slice, however incorporating quantum theory comes at the expense of losing this locality (...)
    Direct download (3 more)  
     
    Export citation  
     
    Bookmark  
  36.  38
    Can Quantum Theory Be Applied to the Universe as a Whole?Claus Kiefer - 2010 - Foundations of Physics 40 (9-10):1410-1418.
    I argue that quantum theory can, and in fact must, be applied to the Universe as a whole. After a general introduction, I discuss two concepts that are essential for my chain of arguments: the universality of quantum theory and the emergence of classical behaviors by decoherence. A further motivation is given by the open problem of quantum gravity. I then present the main ingredients of quantum cosmology and discuss their relevance for the interpretation of (...)
    Direct download (3 more)  
     
    Export citation  
     
    Bookmark   2 citations  
  37.  21
    Big Bang Cosmology, Quantum Tunneling From Nothing, and Creation.William E. Carroll - 1988 - Laval Théologique et Philosophique 44 (1):59-75.
  38.  54
    A Study on Consciousness and Life Energy Based on Quantum Holographic Cosmology.Takeo Oku - 2005 - Journal of International Society of Life Information Science 23 (1):133-143.
  39.  16
    Cosmology and Quantum Mechanical Unstable States for Helium.Donald Gilbert Carpenter - 1994 - Apeiron (Misc) 20:15.
  40. The One Mind Model of Quantum Reality: Whitehead, God, Theories of Mind, Evolution, and Cosmology.Mark Germine - 2010 - Tattva - Journal of Philosophy 2 (1):1-24.
    No categories
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark  
  41.  26
    Symmetry and Evolution in Quantum Gravity.Sean Gryb & Karim Thébaault - 2014 - Foundations of Physics 44 (3):305-348.
    We propose an operator constraint equation for the wavefunction of the Universe that admits genuine evolution. While the corresponding classical theory is equivalent to the canonical decomposition of General Relativity, the quantum theory contains an evolution equation distinct from standard Wheeler–DeWitt cosmology. Furthermore, the local symmetry principle—and corresponding observables—of the theory have a direct interpretation in terms of a conventional gauge theory, where the gauge symmetry group is that of spatial conformal diffeomorphisms (that preserve the spatial volume of (...)
    Direct download (10 more)  
     
    Export citation  
     
    Bookmark   8 citations  
  42.  65
    Quantum Mechanics, Spacetime Locality, and Gravity.Yasunori Nomura - 2013 - Foundations of Physics 43 (8):978-1007.
    Quantum mechanics introduces the concept of probability at the fundamental level, yielding the measurement problem. On the other hand, recent progress in cosmology has led to the “multiverse” picture, in which our observed universe is only one of the many, bringing an apparent arbitrariness in defining probabilities, called the measure problem. In this paper, we discuss how these two problems are related with each other, developing a picture for quantum measurement and cosmological histories in the quantum (...)
    Direct download (4 more)  
     
    Export citation  
     
    Bookmark   2 citations  
  43.  56
    On the Consistency of the Consistent Histories Approach to Quantum Mechanics.Elias Okon & Daniel Sudarsky - 2014 - Foundations of Physics 44 (1):19-33.
    The Consistent Histories (CH) formalism aims at a quantum mechanical framework which could be applied even to the universe as a whole. CH stresses the importance of histories for quantum mechanics, as opposed to measurements, and maintains that a satisfactory formulation of quantum mechanics allows one to assign probabilities to alternative histories of a quantum system. It further proposes that each realm, that is, each set of histories to which probabilities can be assigned, provides a valid (...)
    Direct download (7 more)  
     
    Export citation  
     
    Bookmark   8 citations  
  44.  31
    The Quasiclassical Realms of This Quantum Universe.James B. Hartle - 2011 - Foundations of Physics 41 (6):982-1006.
    The most striking observable feature of our indeterministic quantum universe is the wide range of time, place, and scale on which the deterministic laws of classical physics hold to an excellent approximation. This essay describes how this domain of classical predictability of every day experience emerges from a quantum theory of the universe’s state and dynamics.
    Direct download (4 more)  
     
    Export citation  
     
    Bookmark   12 citations  
  45.  30
    Quantum Analysis of $$K=-1$$ K = - 1 Robertson–Walker Universe.Ciprian Dariescu & Marina-Aura Dariescu - 2015 - Foundations of Physics 45 (11):1495-1513.
    The \\)-Robertson–Walker spacetime is under investigation. With the derived Hamilton operator, we are solving the Wheeler–De Witt Equation and its Schrödinger-like extension, for physically important forms of the effective potential. The closed form solutions, expressed in terms of Heun’s functions, allow us to comment on the occurrence of Universe from highly probable quantum states.
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark  
  46.  31
    Real World Interpretations of Quantum Theory.Adrian Kent - 2012 - Foundations of Physics 42 (3):421-435.
    I propose a new class of interpretations, real world interpretations, of the quantum theory of closed systems. These interpretations postulate a preferred factorization of Hilbert space and preferred projective measurements on one factor. They give a mathematical characterisation of the different possible worlds arising in an evolving closed quantum system, in which each possible world corresponds to a (generally mixed) evolving quantum state. In a realistic model, the states corresponding to different worlds should be expected to tend (...)
    Direct download (5 more)  
     
    Export citation  
     
    Bookmark   2 citations  
  47.  18
    An Inhomogeneous Space–Time Patching Model Based on a Nonlocal and Nonlinear Schrödinger Equation.Christine C. Dantas - 2016 - Foundations of Physics 46 (10):1269-1292.
    We consider an integrable, nonlocal and nonlinear, Schrödinger equation as a model for building space–time patchings in inhomogeneous loop quantum cosmology. We briefly review exact solutions of the NNSE, specially those obtained through “geometric equivalence” methods. Furthemore, we argue that the integrability of the NNSE could be linked to consistency conditions derived from LQC, under the assumption that the patchwork dynamics behaves as an integrable many-body system.
    Direct download (4 more)  
     
    Export citation  
     
    Bookmark  
  48.  12
    Quantum Deep Learning Triuniverse.Angus McCoss - 2016 - Journal of Quantum Information Science 6 (4).
    An original quantum foundations concept of a deep learning computational Universe is introduced. The fundamental information of the Universe (or Triuniverse)is postulated to evolve about itself in a Red, Green and Blue (RGB) tricoloured stable self-mutuality in three information processing loops. The colour is a non-optical information label. The information processing loops form a feedback-reinforced deep learning macrocycle with trefoil knot topology. Fundamental information processing is driven by ψ-Epistemic Drive, the Natural appetite for information selected for advantageous knowledge. From (...)
    Direct download  
     
    Export citation  
     
    Bookmark  
  49.  85
    As Below, So Before: `Synchronic' and `Diachronic' Conceptions of Spacetime Emergence.Karen Crowther - forthcoming - Synthese:1-29.
    Typically, a less fundamental theory, or structure, emerging from a more fundamental one is an example of synchronic emergence. A model (and the physical state it describes) emerging from a prior model (state) upon which it nevertheless depends is an example of diachronic emergence. The case of spacetime emergent from quantum gravity and quantum cosmology challenges these two conceptions of emergence. Here, I propose two more-general conceptions of emergence, analogous to the synchronic and diachronic ones, but which (...)
    Direct download (3 more)  
     
    Export citation  
     
    Bookmark  
  50.  35
    De Sitter Space Without Dynamical Quantum Fluctuations.Kimberly K. Boddy, Sean M. Carroll & Jason Pollack - 2016 - Foundations of Physics 46 (6):702-735.
    We argue that, under certain plausible assumptions, de Sitter space settles into a quiescent vacuum in which there are no dynamical quantum fluctuations. Such fluctuations require either an evolving microstate, or time-dependent histories of out-of-equilibrium recording devices, which we argue are absent in stationary states. For a massive scalar field in a fixed de Sitter background, the cosmic no-hair theorem implies that the state of the patch approaches the vacuum, where there are no fluctuations. We argue that an analogous (...)
    Direct download (5 more)  
     
    Export citation  
     
    Bookmark   2 citations  
1 — 50 / 1000