1. Edwin J. Beggs, José Félix Costa & John V. Tucker (2010). Mr2729665 (2012b: 68075) 68q05. Studia Logica 95 (1-2):279-300.
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  2. Edwin J. Beggs, José Félix Costa & John V. Tucker (2010). Physical Oracles: The Turing Machine and the Wheatstone Bridge. Studia Logica 95 (1/2):279 - 300.
    Earlier, we have studied computations possible by physical systems and by algorithms combined with physical systems. In particular, we have analysed the idea of using an experiment as an oracle to an abstract computational device, such as the Turing machine. The theory of composite machines of this kind can be used to understand (a) a Turing machine receiving extra computational power from a physical process, or (b) an experimenter modelled as a Turing machine performing a test of a known physical (...)
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  3. José Félix Costa, Bruno Loff & Jerzy Mycka (2009). A Foundation for Real Recursive Function Theory. Annals of Pure and Applied Logic 160 (3):255-288.
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