%0 Journal Article %A Liang, Hongtao %A Tang, Yanxia %A Li, Li %A Wei, Zhouchao %A Wang, Zhen %T Degenerate Hopf bifurcations and the formation mechanism of chaos in the Qi 3-D four-wing chaotic system %J Kybernetika %D 2013 %P 935-947 %V 49 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/KYB_2013__49_6_a6/ %G en %F KYB_2013__49_6_a6