354287.fig.003a
(a)
354287.fig.003b
(b)
354287.fig.003c
(c)
354287.fig.003d
(d)
Figure 3: Trajectories of , and for , and (0.347644, 0.0760948, 0.0760948, 4.51674, 0.330353, 0.0765909, 0.0765909, 4.4678) is globally stable. , and versus are illustrated by (a), (b), (c), and (d). Initial values are , and .