Geodesic
The number of limit cycles of a certain second order autonumous system
Differencialʹnye uravneniâ, Tome 12 (1976) no. 5, pp. 944-946.

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     author = {L. A. Cherkas},
     title = {The number of limit cycles of a certain second order autonumous system},
     journal = {Differencialʹnye uravneni\^a},
     pages = {944--946},
     publisher = {mathdoc},
     volume = {12},
     number = {5},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1976_12_5_a21/}
}
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L. A. Cherkas. The number of limit cycles of a certain second order autonumous system. Differencialʹnye uravneniâ, Tome 12 (1976) no. 5, pp. 944-946. http://geodesic.mathdoc.fr/item/DE_1976_12_5_a21/