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@article{DE_1966_2_6_a8, author = {V. D. Kopchenov}, title = {A variational problem with a small parameter. {I}}, journal = {Differencialʹnye uravneni\^a}, pages = {799--815}, publisher = {mathdoc}, volume = {2}, number = {6}, year = {1966}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1966_2_6_a8/} }
V. D. Kopchenov. A variational problem with a small parameter. I. Differencialʹnye uravneniâ, Tome 2 (1966) no. 6, pp. 799-815. http://geodesic.mathdoc.fr/item/DE_1966_2_6_a8/