@article{FAA_1979_13_2_a6,
     author = {F. S. Berezovskaya},
     title = {Index of a stationary point of a vector field on the plane},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {77},
     year = {1979},
     volume = {13},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1979_13_2_a6/}
}