1. D. Gabbay, The Dedidability of the Kreisel-Putnam System, JSL, 35 (1970), 431–437.
2. D. Gabbay, Applications of Trees to Intermediate Logics I, JSL, 36 (1971).
3. J-Y. Girard, Une Extension De L'Interpretation De Gödel A L'Analyse, Et Son Application A L'Elimination Des Coupures Dans L'Analyse Et La Theorie Des Types, in: J. E. Fenstad (editor), Proceedings of the Second Scandinavian Logic Symposium, North-Holland, 1971, 63–92.
4. D. deJongh, The Maximality of the Intuitionistic Predicate Calculus with Respect to Heyting's Arithmetic, presented at the Second Scandinavian Logic Symposium at Oslo, June 1970.
5. S. C. Kleene, On the Interpretation of Intuitionistic Number Theory, JSL, 10 (1945), 109–124.