@article{1183529093, author = {Robinson, Abraham}, title = {Nonstandard arithmetic}, journal = {Bull. Amer. Math. Soc.}, volume = {73}, number = {6}, year = {1967}, pages = { 818-843}, language = {en}, url = {http://dml.mathdoc.fr/item/1183529093} }
Robinson, Abraham. Nonstandard arithmetic. Bull. Amer. Math. Soc., Tome 73 (1967) no. 6, pp. 818-843. http://gdmltest.u-ga.fr/item/1183529093/