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@article{DE_1982_18_12_a8, author = {A. B. Vasil'eva}, title = {Periodic solutions of equations of elliptic type with small parameters}, journal = {Differencialʹnye uravneni\^a}, pages = {2174--2178}, publisher = {mathdoc}, volume = {18}, number = {12}, year = {1982}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1982_18_12_a8/} }
A. B. Vasil'eva. Periodic solutions of equations of elliptic type with small parameters. Differencialʹnye uravneniâ, Tome 18 (1982) no. 12, pp. 2174-2178. http://geodesic.mathdoc.fr/item/DE_1982_18_12_a8/