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@article{DE_1976_12_2_a6, author = {A. D. Morozov}, title = {The complete qualitative investigation of {Duffing's} equation}, journal = {Differencialʹnye uravneni\^a}, pages = {241--255}, publisher = {mathdoc}, volume = {12}, number = {2}, year = {1976}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1976_12_2_a6/} }
A. D. Morozov. The complete qualitative investigation of Duffing's equation. Differencialʹnye uravneniâ, Tome 12 (1976) no. 2, pp. 241-255. http://geodesic.mathdoc.fr/item/DE_1976_12_2_a6/