@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/}
}