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@article{DAN_1961_136_2_a11, author = {A. S. Schwarz}, title = {Some notions connected with that of the genus of a fibre space}, journal = {Doklady Akademii Nauk}, pages = {301--303}, publisher = {mathdoc}, volume = {136}, number = {2}, year = {1961}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1961_136_2_a11/} }
A. S. Schwarz. Some notions connected with that of the genus of a fibre space. Doklady Akademii Nauk, Tome 136 (1961) no. 2, pp. 301-303. http://geodesic.mathdoc.fr/item/DAN_1961_136_2_a11/