@article{DAN_1961_141_2_a9,
     author = {P. P. Zabreiko and M. A. Krasnosel'skii},
     title = {Calculation of the index of an isolated stationary point of a completely continuous vector field},
     journal = {Doklady Akademii Nauk},
     pages = {292--295},
     publisher = {mathdoc},
     volume = {141},
     number = {2},
     year = {1961},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1961_141_2_a9/}
}