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@article{DE_1966_2_8_a2, author = {A. N. Erugin}, title = {On extremals}, journal = {Differencialʹnye uravneni\^a}, pages = {1027--1030}, publisher = {mathdoc}, volume = {2}, number = {8}, year = {1966}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1966_2_8_a2/} }
A. N. Erugin. On extremals. Differencialʹnye uravneniâ, Tome 2 (1966) no. 8, pp. 1027-1030. http://geodesic.mathdoc.fr/item/DE_1966_2_8_a2/