1. The strength of Martin-Löf's intuitionistic type theory with one universe;Aczel,1977
2. The type theoretic interpretation of constructive set theory;Aczel,1979
3. The non-derivability in intuitionistic formal systems of theorems on the continuity of effective operations;Beeson;J. Symbolic Logic,1975
4. The unprovability in intuitionistic formal systems of the continuity of effective operations on the reals;Beeson;J. Symbolic Logic,1977
5. Priciples of continuous choice and continuity of functions in formal systems fro constructive mathematics;Beeson;Ann. Math. Logic,1977