@article{DE_1974_10_2_a26,
     author = {L. A. Cherkas},
     title = {Conditions for a center for the equation $P_3(x)yy'=\sum_{i=0}^2P_i(x)y^i$},
     journal = {Differencialʹnye uravneni\^a},
     pages = {367--368},
     publisher = {mathdoc},
     volume = {10},
     number = {2},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1974_10_2_a26/}
}