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@article{DE_1983_19_12_a2, author = {A. A. Kadirov}, title = {Singular points of differential equations with nonoriented trajectories on a plane}, journal = {Differencialʹnye uravneni\^a}, pages = {2039--2048}, publisher = {mathdoc}, volume = {19}, number = {12}, year = {1983}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1983_19_12_a2/} }
A. A. Kadirov. Singular points of differential equations with nonoriented trajectories on a plane. Differencialʹnye uravneniâ, Tome 19 (1983) no. 12, pp. 2039-2048. http://geodesic.mathdoc.fr/item/DE_1983_19_12_a2/