1. An algebraic study of Diodorean modal systems;Bull;Journal of Symbolic Logic,1965
2. Haskell B. Curry A theory of formal deducibility
3. A propositional calculus with denumerable matrix;Dummett;Journal of Symbolic Logic,1959
4. Modal logics between S4 and S5;Dummett;Zeitschrift für mathematische Logik und Grundlagen der Mathematik,1959
5. The separation theorem of intuitionist propositional calculus;Horn;Journal of Symbolic Logic,1962