@article{DAN_1961_141_1_a12,
     author = {A. S. Schwarz},
     title = {On the homotopy theory of fiber spaces},
     journal = {Doklady Akademii Nauk},
     pages = {51--54},
     publisher = {mathdoc},
     volume = {141},
     number = {1},
     year = {1961},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1961_141_1_a12/}
}