On the coexistence of limit cycles and singular points of ``center'' type of cubic differential systems
Differencialʹnye uravneniâ, Tome 31 (1995) no. 1, pp. 173-174.

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     author = {D. S. Ushkho},
     title = {On the coexistence of limit cycles and singular points of ``center'' type of cubic differential systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {173--174},
     publisher = {mathdoc},
     volume = {31},
     number = {1},
     year = {1995},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1995_31_1_a28/}
}
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D. S. Ushkho. On the coexistence of limit cycles and singular points of ``center'' type of cubic differential systems. Differencialʹnye uravneniâ, Tome 31 (1995) no. 1, pp. 173-174. http://geodesic.mathdoc.fr/item/DE_1995_31_1_a28/