Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1971_198_4_a10, author = {G. V. Chudnovskii and D. V. Chudnovskii}, title = {Regular and descending incomplete ultrafilters}, journal = {Doklady Akademii Nauk}, pages = {779--782}, publisher = {mathdoc}, volume = {198}, number = {4}, year = {1971}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1971_198_4_a10/} }
G. V. Chudnovskii; D. V. Chudnovskii. Regular and descending incomplete ultrafilters. Doklady Akademii Nauk, Tome 198 (1971) no. 4, pp. 779-782. http://geodesic.mathdoc.fr/item/DAN_1971_198_4_a10/