@article{1183736310, author = {Geiser, James R.}, title = {Nonstandard Logic}, journal = {J. Symbolic Logic}, volume = {33}, number = {1}, year = {1968}, pages = { 236-250}, language = {en}, url = {http://dml.mathdoc.fr/item/1183736310} }
Geiser, James R. Nonstandard Logic. J. Symbolic Logic, Tome 33 (1968) no. 1, pp. 236-250. http://gdmltest.u-ga.fr/item/1183736310/