@article{1183732300, author = {Henkin, Leon}, title = {Two Concepts From the Theory of Models}, journal = {J. Symbolic Logic}, volume = {21}, number = {1}, year = {1956}, pages = { 28-32}, language = {en}, url = {http://dml.mathdoc.fr/item/1183732300} }
Henkin, Leon. Two Concepts From the Theory of Models. J. Symbolic Logic, Tome 21 (1956) no. 1, pp. 28-32. http://gdmltest.u-ga.fr/item/1183732300/