Submitted on: 13 September 2006.
Revised on: 12 October 2006.
Accepted on: 30 October 2006.
Nonlinear Analysis-Hybrid Systems
Submitted on: 02 March 2000.
Revised on: 06 April 2000.
Accepted on: 16 April 2000.
Nonlinear Analysis-Hybrid Systems
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