@article{DE_1976_12_8_a2,
     author = {A. R. Artykov and I. G. Rozet and B. I. Toporovskaya},
     title = {Some cases of local generation of limit cycles in three-dimensional space},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1392--1403},
     publisher = {mathdoc},
     volume = {12},
     number = {8},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1976_12_8_a2/}
}