Solomon Feferman. Some applications of the notions of forcing and generic sets (Summary). The theory of models, Proceedings of the 1963 International Symposium at Berkeley, edited by J. W. Addison, Leon Henkin, and Alfred Tarski, Studies in logic and the foundations of mathematics, North-Holland Publishing Company, Amsterdam1965, pp. 89–95. - Solomon Feferman. Some applications of the notions of forcing and generic sets. Fundamenta mathematicae, vol. 56 no. 3 (1965), pp. 325–345.