Fig. 7

The bifurcation portraits of system (12) with \(\Im _{11}=1,\Im _{31}=-1\), \(r=\sqrt{z_1^{2}+U_1^{2}}\). (a) \(\varpi = 0.8\) (b) \(\varpi = 1\) (c) \(\varpi = 1.2\).

The bifurcation portraits of system (12) with \(\Im _{11}=1,\Im _{31}=-1\), \(r=\sqrt{z_1^{2}+U_1^{2}}\). (a) \(\varpi = 0.8\) (b) \(\varpi = 1\) (c) \(\varpi = 1.2\).