@article{DE_1972_8_8_a1,
     author = {T. F. Bulatskaya},
     title = {The construction of a set of systems of differential equations that have prescribed curves as their limit cycles},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1349--1356},
     publisher = {mathdoc},
     volume = {8},
     number = {8},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1972_8_8_a1/}
}