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@article{DE_1968_4_12_a7, author = {N. I. Avdonin}, title = {The relative position of the separatrices}, journal = {Differencialʹnye uravneni\^a}, pages = {2230--2242}, publisher = {mathdoc}, volume = {4}, number = {12}, year = {1968}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1968_4_12_a7/} }
N. I. Avdonin. The relative position of the separatrices. Differencialʹnye uravneniâ, Tome 4 (1968) no. 12, pp. 2230-2242. http://geodesic.mathdoc.fr/item/DE_1968_4_12_a7/