1. Some applications of Kleene's methods for intuitionistic systems;Friedman,1973
2. Eine Interpretation des Intuitionistischen Aussagenkalkuls;Gödel;Ergebnisse eines mathematischen Kolloquiums,1932
3. A genuinely intensional set theory;Goodman,1985
4. Epistemic arithmetic is a conservative extension of intuitionistic arithmetic;Goodman;J. Symbolic Logic,1984
5. The effective topos;Hyland,1982