@article{DE_1971_7_10_a6,
     author = {I. S. Kukles and I. G. Rozet},
     title = {The singular separatrix cycles of a quadratic differential equation that has a straight line as a solution},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1813--1818},
     publisher = {mathdoc},
     volume = {7},
     number = {10},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1971_7_10_a6/}
}