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@article{DAN_1969_188_4_a7, author = {B. I. Rozenfel'd}, title = {Principal bundles whose base spaces satisfy the second countability axiom}, journal = {Doklady Akademii Nauk}, pages = {758--761}, publisher = {mathdoc}, volume = {188}, number = {4}, year = {1969}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1969_188_4_a7/} }
B. I. Rozenfel'd. Principal bundles whose base spaces satisfy the second countability axiom. Doklady Akademii Nauk, Tome 188 (1969) no. 4, pp. 758-761. http://geodesic.mathdoc.fr/item/DAN_1969_188_4_a7/