@article{DE_1993_29_4_a21,
     author = {A. S. Shube},
     title = {On the {Kukles} and {Cherkas} center conditions for a cubic system},
     journal = {Differencialʹnye uravneni\^a},
     pages = {728--730},
     publisher = {mathdoc},
     volume = {29},
     number = {4},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1993_29_4_a21/}
}