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@article{DE_1975_11_4_a21, author = {S. K. Norkin}, title = {Uniqueness of the $O$-curve along a direction that is analogous to the exceptional one}, journal = {Differencialʹnye uravneni\^a}, pages = {758--759}, publisher = {mathdoc}, volume = {11}, number = {4}, year = {1975}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1975_11_4_a21/} }
S. K. Norkin. Uniqueness of the $O$-curve along a direction that is analogous to the exceptional one. Differencialʹnye uravneniâ, Tome 11 (1975) no. 4, pp. 758-759. http://geodesic.mathdoc.fr/item/DE_1975_11_4_a21/