@article{DAN_1988_303_4_a6, author = {K. S. Sibirskii and A. S. \c{S}ub\u{a}}, title = {Coefficient conditions for a center in the sense of {Dulac} for a differential system with one zero characteristic root and cubic right-hand sides}, journal = {Doklady Akademii Nauk}, pages = {799--803}, publisher = {mathdoc}, volume = {303}, number = {4}, year = {1988}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1988_303_4_a6/} }