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@article{DAN_1994_337_5_a13, author = {M. V. Shamolin}, title = {A new two-parameter family of phase portraits in the problem of}, journal = {Doklady Akademii Nauk}, pages = {611--614}, publisher = {mathdoc}, volume = {337}, number = {5}, year = {1994}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1994_337_5_a13/} }
M. V. Shamolin. A new two-parameter family of phase portraits in the problem of. Doklady Akademii Nauk, Tome 337 (1994) no. 5, pp. 611-614. http://geodesic.mathdoc.fr/item/DAN_1994_337_5_a13/