@article{GDZPPN00230399X, title = {Some Special Properties of Cofinality of Ordinal Numbers.}, journal = {Mathematische Annalen}, volume = {189}, year = {1970}, pages = {325-329}, zbl = {0193.30802}, url = {http://dml.mathdoc.fr/item/GDZPPN00230399X} }
ABIAN, A. Some Special Properties of Cofinality of Ordinal Numbers.. Mathematische Annalen, Tome 189 (1970) pp. 325-329. http://gdmltest.u-ga.fr/item/GDZPPN00230399X/