1. Aczel, P. 1977a. An introduction to inductive definitions. In Handbook of mathematical logic, ed. J. Barwise, 739–782. Amsterdam: North-Holland.
2. Aczel, P. 1977b. The strength of Martin-Löf’s type theory with one universe. In Proceedings of the symposium on mathematical logic (Oulu 1974), ed. S. Miettinen and J. Väänanen, 1–32. Report No 2 of Department of Philosophy, University of Helsinki.
3. Aczel, P. 1980. Frege structures and the notions of proposition, truth, and set. In The kleene symposium, ed. J. Barwise, H.J. Keisler, and K. Kunen, 31–59. Amsterdam: North-Holland.
4. Allen, S.F. 1987a A non-type-theoretic definition of Martin-Löf’s types. In Proceedings of second IEEE symposium on logic in computer Science, New York, 215–224.
5. Allen, S.F. 1987b. A Non-type-theoretic semantics for type-theoretic language. Ph.D. thesis, Cornell University.