Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1986_287_1_a1, author = {A. V. Arkhangel'skii}, title = {$R$-factor mappings of spaces with a countable base}, journal = {Doklady Akademii Nauk}, pages = {14--17}, publisher = {mathdoc}, volume = {287}, number = {1}, year = {1986}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1986_287_1_a1/} }
A. V. Arkhangel'skii. $R$-factor mappings of spaces with a countable base. Doklady Akademii Nauk, Tome 287 (1986) no. 1, pp. 14-17. http://geodesic.mathdoc.fr/item/DAN_1986_287_1_a1/