@article{1183738235, author = {Andrews, Peter B.}, title = {General Models and Extensionality}, journal = {J. Symbolic Logic}, volume = {37}, number = {1}, year = {1972}, pages = { 395-397}, language = {en}, url = {http://dml.mathdoc.fr/item/1183738235} }
Andrews, Peter B. General Models and Extensionality. J. Symbolic Logic, Tome 37 (1972) no. 1, pp. 395-397. http://gdmltest.u-ga.fr/item/1183738235/