1. Bainbridge E. S., Freyd P. J., Scedrov A., Scott P. J. [88], Functorial polymorphism. In: "Logical Foundations of Functional Programming" (G. Huet, ed.), Addison-Wesley, to appear.
2. Beeson M. [1985], "Foundations of constructive mathematics". Ergeb. der Math., Springer-Verlag, New York.
3. Boileau A., Joyal A. [1981], La logique des topos. J. Symb. Logic 46, 6–16.
4. Breazu-Tannen V., Coquand T. [87], Extensional models for polymorphism. Proc. TAPSOFT '87 — CFLP, Pisa, Theor. Comp. Sci., to appear.
5. Bruce K. B., Meyer A. R., Mitchell J. C. [87], The semantics of second-order lambda calculus. Information & Computation, to appear.