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@article{DE_1966_2_7_a11, author = {V. D. Kopchenov}, title = {A variational problem with a small parameter. {II}}, journal = {Differencialʹnye uravneni\^a}, pages = {967--987}, publisher = {mathdoc}, volume = {2}, number = {7}, year = {1966}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1966_2_7_a11/} }
V. D. Kopchenov. A variational problem with a small parameter. II. Differencialʹnye uravneniâ, Tome 2 (1966) no. 7, pp. 967-987. http://geodesic.mathdoc.fr/item/DE_1966_2_7_a11/