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@article{DE_1972_8_12_a4, author = {I. M. Vul'pe}, title = {A certain theorem of {Erugin}}, journal = {Differencialʹnye uravneni\^a}, pages = {2156--2162}, publisher = {mathdoc}, volume = {8}, number = {12}, year = {1972}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1972_8_12_a4/} }
I. M. Vul'pe. A certain theorem of Erugin. Differencialʹnye uravneniâ, Tome 8 (1972) no. 12, pp. 2156-2162. http://geodesic.mathdoc.fr/item/DE_1972_8_12_a4/