@article{DE_2002_38_10_a1,
     author = {M. V. Dolov and Yu. V. Pavlyuk},
     title = {Elliptic {Limit} {Cycles} of {Two-Dimensional} {Autonomous} {Differential} {Systems}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1303--1309},
     year = {2002},
     volume = {38},
     number = {10},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2002_38_10_a1/}
}