1. Toposes, Triples and Theories;Barr,1985
2. A categorical approach to realizability and polymorphic types;Carboni,1988
3. Introduction to Higher Order Categorical Logic;Lambek,1986
4. Categorical fixed point semantics;Mulry;Theoret. Comput. Sci.,1990
5. G. Rosolini, About modest sets, to appear.