@article{DE_1971_7_12_a21,
     author = {Z. M. Kochetkova},
     title = {The isochrony of a system of three differential equations in the presence of a family of nonperiodic solutions in the neighborhood of the origin},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2279--2282},
     publisher = {mathdoc},
     volume = {7},
     number = {12},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1971_7_12_a21/}
}