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@article{DE_1989_25_7_a24, author = {Z. S. Batalova and N. A. Ezhevskaya}, title = {The structure of the phase space of the {Duffing} equation}, journal = {Differencialʹnye uravneni\^a}, pages = {1270--1271}, publisher = {mathdoc}, volume = {25}, number = {7}, year = {1989}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1989_25_7_a24/} }
Z. S. Batalova; N. A. Ezhevskaya. The structure of the phase space of the Duffing equation. Differencialʹnye uravneniâ, Tome 25 (1989) no. 7, pp. 1270-1271. http://geodesic.mathdoc.fr/item/DE_1989_25_7_a24/