@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/}
}