@article{DE_1974_10_7_a9,
     author = {G. M. Buldyk},
     title = {Integral curves of the differential equation $(1+x)yy'=-x P_3(x)-x P_1(x)y+\delta y^2$ with a center},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1231--1241},
     publisher = {mathdoc},
     volume = {10},
     number = {7},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1974_10_7_a9/}
}