@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/