%0 Journal Article %A Dias, Fabio Scalco %A Mello, Luis Fernando %T Hopf bifurcations and small amplitude limit cycles in Rucklidge systems %J Electronic journal of differential equations %D 2013 %V 2013 %U http://geodesic.mathdoc.fr/item/EJDE_2013__2013__a3/ %G en %F EJDE_2013__2013__a3