746241.fig.001a
(a)
746241.fig.001b
(b)
746241.fig.001c
(c)
746241.fig.001d
(d)
Figure 1: (a) Time-series of the of model (55) without impulsive effects for . (b) Time-series of the of model (55) without impulsive effects for . (c) Time-series of the of model (55) with impulsive effects for . (d) Time-series of the of model (55) with impulsive effects for .