@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/}
}