@article{DE_1984_20_9_a21,
     author = {P. B. Golokvoschyus},
     title = {Periodic solutions of a special nonlinear differential system},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1623--1628},
     publisher = {mathdoc},
     volume = {20},
     number = {9},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1984_20_9_a21/}
}