@article{01780382,
title = {Center conditions for a simple class of quintic systems.},
journal = {International Journal of Mathematics and Mathematical Sciences},
volume = {30},
year = {2002},
pages = {625-632},
doi = {10.1155/S0161171202012802},
zbl = {1008.34023},
language = {en},
url = {http://dml.mathdoc.fr/item/01780382}
}
Volokitin, Evgenii P. Center conditions for a simple class of quintic systems.. International Journal of Mathematics and Mathematical Sciences, Tome 30 (2002) pp. 625-632. doi : 10.1155/S0161171202012802. http://gdmltest.u-ga.fr/item/01780382/