@article{DE_1996_32_7_a16,
     author = {N. G. Makeev},
     title = {Center conditions for a system with fifth-order nonlinearities of a special form},
     journal = {Differencialʹnye uravneni\^a},
     pages = {990--991},
     publisher = {mathdoc},
     volume = {32},
     number = {7},
     year = {1996},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1996_32_7_a16/}
}