1. On closure under direct product;Chang, C. C.;J. Symbolic Logic,1958
2. Decidability of the elementary theory of relatively complemented lattices and of the theory of filters;Eršov, Ju. L.;Algebra i Logika Sem.,1964
3. The first order properties of products of algebraic systems;Feferman, S.;Fund. Math.,1959
4. Reduced direct products;Frayne, T.;Fund. Math.,1962
5. Van Nostrand Mathematical Studies, No. 1;Halmos, Paul R.,1963