Peter Aczel. The strength of Martin-Löf's intuitionistic type theory with one universe. Proceedings of the symposiums on mathematical logic in Oulu 1974 and in Helsinki 1975, edited by Seppo Miettinen and Jouko Väänänen, The department of philosophy, University of Helsinki, Helsinki1977, pp. 1–32.
Wim Veldman · Journal of Symbolic Logic · 1984
Peter Aczel. The strength of Martin-Löf's intuitionistic type theory with one universe. Proceedings of the symposiums on mathematical logic in Oulu 1974 and in Helsinki 1975, edited by Seppo Miettinen and Jouko Väänänen, The department of philosophy, University of Helsinki, Helsinki1977, pp. 1–32. - Volume 49 Issue 1