@article{DE_1989_25_2_a34,
     author = {R. M. Mints},
     title = {Limit cycles of a quadratic system of differential equations in the presence of an integral line},
     journal = {Differencialʹnye uravneni\^a},
     pages = {351--352},
     publisher = {mathdoc},
     volume = {25},
     number = {2},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1989_25_2_a34/}
}