Geodesic
On the existence and location of limit cycles in an autonomous system
Differencialʹnye uravneniâ, Tome 21 (1985) no. 6, pp. 1079-1081 
L. I. Zhilevich. On the existence and location of limit cycles in an autonomous system. Differencialʹnye uravneniâ, Tome 21 (1985) no. 6, pp. 1079-1081. http://geodesic.mathdoc.fr/item/DE_1985_21_6_a23/
@article{DE_1985_21_6_a23,
     author = {L. I. Zhilevich},
     title = {On the existence and location of limit cycles in an autonomous system},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1079--1081},
     year = {1985},
     volume = {21},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1985_21_6_a23/}
}
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IS  - 6
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