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  1. A Short Introduction to Intuitionistic Logic.Helmut Schwichtenberg - 2002 - Bulletin of Symbolic Logic 8 (4):520-521.
  • ASH, CJ, Stability of recursive structures in arithmetical degrees BLASS, A. and GUREVICH, Y., Henkin quantifiers and complete problems BUCHHOLZ, W., A new system of proof-theoretic ordinal functions. [REVIEW]H. Friedman & Rc Flagg - 1986 - Annals of Pure and Applied Logic 32 (C):299.
  • Epistemic and intuitionistic formal systems.R. C. Flagg & H. Friedman - 1986 - Annals of Pure and Applied Logic 32:53-60.