Geodesic
On conditions for a center and focus for nonlinear oscillation equations
Differencialʹnye uravneniâ, Tome 15 (1979) no. 9, pp. 1716-1719.

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@article{DE_1979_15_9_a21,
     author = {A. P. Sadovskii},
     title = {On conditions for a center and focus for nonlinear oscillation equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1716--1719},
     publisher = {mathdoc},
     volume = {15},
     number = {9},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1979_15_9_a21/}
}
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A. P. Sadovskii. On conditions for a center and focus for nonlinear oscillation equations. Differencialʹnye uravneniâ, Tome 15 (1979) no. 9, pp. 1716-1719. http://geodesic.mathdoc.fr/item/DE_1979_15_9_a21/