@article{DE_1979_15_4_a8,
     author = {A. A. Shestakov and A. N. Stepanov},
     title = {Index and divergence criteria for the stability of a singular point of an autonomous system of differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {650--661},
     publisher = {mathdoc},
     volume = {15},
     number = {4},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1979_15_4_a8/}
}