@article{DE_2001_37_9_a0,
     author = {M. V. Dolov},
     title = {Algebraical {Limit} {Cycles} of {Polynomial} {Vector} {Fields} on the {Plane}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1155--1160},
     publisher = {mathdoc},
     volume = {37},
     number = {9},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2001_37_9_a0/}
}