Ashok Kumar Mittal½'¾, Arti Dwivedi½'¾ and Suneet Dwivedi¾. 1Physics ... A. K. MITTAL, A. DWIVEDI AND S. DWIVEDI ..... the null solution is a globally stable solution of Equation (4). .... values of (12), is independent of the oscillation time scale TC of the chaotic drive system, ..... in a class of chaotic systems, Commun.