252487.fig.004a
(a) and
252487.fig.004b
(b) and
252487.fig.004c
(c) and
252487.fig.004d
(d) and .
Figure 4: Comparison of the corresponding variables in the controlled hyperchaotic R ssler system and its reference system: (a) and ; (b) and ; (c) and ; (d) and .