@article{05726186, title = {Limit cycles of a class of Hilbert's sixteenth problem presented by fractional differential equations.}, journal = {Advances in Difference Equations [electronic only]}, volume = {2010}, year = {2010}, doi = {10.1155/2010/938180}, zbl = {1200.34005}, language = {en}, url = {http://dml.mathdoc.fr/item/05726186} }
Erjaee, G.H.; Zangeneh, H.R.Z.; Nyamoradi, N. Limit cycles of a class of Hilbert's sixteenth problem presented by fractional differential equations.. Advances in Difference Equations [electronic only], Tome 2010 (2010) . doi : 10.1155/2010/938180. http://gdmltest.u-ga.fr/item/05726186/