@article{1183731313, author = {Mostowski, Andrzej}, title = {On Direct Products of Theories}, journal = {J. Symbolic Logic}, volume = {17}, number = {1}, year = {1952}, pages = { 1-31}, language = {en}, url = {http://dml.mathdoc.fr/item/1183731313} }
Mostowski, Andrzej. On Direct Products of Theories. J. Symbolic Logic, Tome 17 (1952) no. 1, pp. 1-31. http://gdmltest.u-ga.fr/item/1183731313/