1. Carnap, R.,The aim of inductive logic, Logic, Methodology and Philosophy of Science: Proceedings of the 1960 International Congress, edited by E. Nagel, P. Suppes, and A. Tarski, Stanford University Press, 1962, pp 303–318.
2. Gaifman, Haim,Probability models and the completeness theorem. International Congress of Logic, Methodology and Philosophy of Science, 1960, Abstracts of Contributed papers, pp. 77–78.
3. Gaifman, Haim,Concerning measures on Boolean algebras. Pacific J. of Mathematics14 (1964), 61–73.
4. Hahn and Rosenthal, Set Functions, The University of New Mexico Press, New Mexico, 1948.
5. Horn, Alfred and Tarski, Alfred,Measures in Boolean algebras, Trans. Amer. Math. Soc.64 (1948), pp 467–497.