Geodesic
Integrating factors and limit cycles
Differencialʹnye uravneniâ, Tome 26 (1990) no. 3, pp. 542-544 
Yu. V. Malyshev; V. P. Zakharov. Integrating factors and limit cycles. Differencialʹnye uravneniâ, Tome 26 (1990) no. 3, pp. 542-544. http://geodesic.mathdoc.fr/item/DE_1990_26_3_a28/
@article{DE_1990_26_3_a28,
     author = {Yu. V. Malyshev and V. P. Zakharov},
     title = {Integrating factors and limit cycles},
     journal = {Differencialʹnye uravneni\^a},
     pages = {542--544},
     year = {1990},
     volume = {26},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1990_26_3_a28/}
}
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