Some tests for the absence or uniqueness of limit cycles
Differencialʹnye uravneniâ, Tome 6 (1970) no. 7, pp. 1170-1178.

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     author = {L. A. Cherkas and L. I. Zhilevich},
     title = {Some tests for the absence or uniqueness of limit cycles},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1170--1178},
     publisher = {mathdoc},
     volume = {6},
     number = {7},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1970_6_7_a2/}
}
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L. A. Cherkas; L. I. Zhilevich. Some tests for the absence or uniqueness of limit cycles. Differencialʹnye uravneniâ, Tome 6 (1970) no. 7, pp. 1170-1178. http://geodesic.mathdoc.fr/item/DE_1970_6_7_a2/