@article{1183526119, author = {Keisler, H. Jerome}, title = {On cardinalities of ultraproducts}, journal = {Bull. Amer. Math. Soc.}, volume = {70}, number = {6}, year = {1964}, pages = { 644-647}, language = {en}, url = {http://dml.mathdoc.fr/item/1183526119} }
Keisler, H. Jerome. On cardinalities of ultraproducts. Bull. Amer. Math. Soc., Tome 70 (1964) no. 6, pp. 644-647. http://gdmltest.u-ga.fr/item/1183526119/