@article{DE_2002_38_2_a5,
     author = {V. G. Romanovsky and M. Robnik},
     title = {Computation of the {Center} {Isochronism} {Conditions} for {Polynomial} {Systems}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {195--200},
     publisher = {mathdoc},
     volume = {38},
     number = {2},
     year = {2002},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2002_38_2_a5/}
}