@article{DE_1968_4_8_a7,
     author = {V. M. Lebedeva},
     title = {The number of periodic solutions of a first order differential equation with polynomial right hand side},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1428--1432},
     publisher = {mathdoc},
     volume = {4},
     number = {8},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1968_4_8_a7/}
}