Geodesic
On the number of cycles of some differential equations on a two-dimensional torus
Differencialʹnye uravneniâ, Tome 27 (1991) no. 12, pp. 2167-2169.

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@article{DE_1991_27_12_a20,
     author = {E. K. Ershov},
     title = {On the number of cycles of some differential equations on a two-dimensional torus},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2167--2169},
     publisher = {mathdoc},
     volume = {27},
     number = {12},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1991_27_12_a20/}
}
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E. K. Ershov. On the number of cycles of some differential equations on a two-dimensional torus. Differencialʹnye uravneniâ, Tome 27 (1991) no. 12, pp. 2167-2169. http://geodesic.mathdoc.fr/item/DE_1991_27_12_a20/