Geodesic
Certain sufficient tests for the existence of limit cycles of a certain dynamic system
Differencialʹnye uravneniâ, Tome 7 (1971) no. 2, pp. 226-231 
I. A. Konovalov. Certain sufficient tests for the existence of limit cycles of a certain dynamic system. Differencialʹnye uravneniâ, Tome 7 (1971) no. 2, pp. 226-231. http://geodesic.mathdoc.fr/item/DE_1971_7_2_a4/
@article{DE_1971_7_2_a4,
     author = {I. A. Konovalov},
     title = {Certain sufficient tests for the existence of limit cycles of a certain dynamic system},
     journal = {Differencialʹnye uravneni\^a},
     pages = {226--231},
     year = {1971},
     volume = {7},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1971_7_2_a4/}
}
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