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@article{DE_1970_6_7_a4, author = {N. I. Avdonin}, title = {A certain method of investigating separatrices}, journal = {Differencialʹnye uravneni\^a}, pages = {1188--1199}, publisher = {mathdoc}, volume = {6}, number = {7}, year = {1970}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1970_6_7_a4/} }
N. I. Avdonin. A certain method of investigating separatrices. Differencialʹnye uravneniâ, Tome 6 (1970) no. 7, pp. 1188-1199. http://geodesic.mathdoc.fr/item/DE_1970_6_7_a4/