@article{DE_1985_21_6_a0,
     author = {A. V. Zhevnyak},
     title = {The direction vector method for investigating the stability of singular points of nonlinear systems. {II.} {Partial} results, examples and discussions},
     journal = {Differencialʹnye uravneni\^a},
     pages = {923--932},
     publisher = {mathdoc},
     volume = {21},
     number = {6},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1985_21_6_a0/}
}