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@article{DE_1977_13_7_a6, author = {G. E. Popov}, title = {A class of integrable systems with a small parameter}, journal = {Differencialʹnye uravneni\^a}, pages = {1214--1217}, publisher = {mathdoc}, volume = {13}, number = {7}, year = {1977}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1977_13_7_a6/} }
G. E. Popov. A class of integrable systems with a small parameter. Differencialʹnye uravneniâ, Tome 13 (1977) no. 7, pp. 1214-1217. http://geodesic.mathdoc.fr/item/DE_1977_13_7_a6/