@article{DE_1997_33_5_a19,
     author = {A. F. Andreev and I. A. Andreeva},
     title = {On limit and separatrix cycles of a quasiquadratic system},
     journal = {Differencialʹnye uravneni\^a},
     pages = {700--701},
     publisher = {mathdoc},
     volume = {33},
     number = {5},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1997_33_5_a19/}
}