@article{DE_1994_30_7_a3,
     author = {M. V. Dolov and R. V. Kuz'min},
     title = {On limit cycles of systems with a given partial integral},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1125--1132},
     publisher = {mathdoc},
     volume = {30},
     number = {7},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1994_30_7_a3/}
}