@article{1183733915, author = {Craig, William}, title = {Bases for First-Order Theories and Subtheories}, journal = {J. Symbolic Logic}, volume = {25}, number = {1}, year = {1960}, pages = { 97-142}, language = {en}, url = {http://dml.mathdoc.fr/item/1183733915} }
Craig, William. Bases for First-Order Theories and Subtheories. J. Symbolic Logic, Tome 25 (1960) no. 1, pp. 97-142. http://gdmltest.u-ga.fr/item/1183733915/