@article{DAN_1958_118_1_a10,
     author = {R. L. Frum-Ketkov},
     title = {The behaviour of cycles not homologous to zero when a $n$-dimensional manifold is mapped into},
     journal = {Doklady Akademii Nauk},
     pages = {42--44},
     year = {1958},
     volume = {118},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1958_118_1_a10/}
}