Submitted on: 31 August 2009.
Revised on: 26 October 2009.
Accepted on: 13 December 2009.
___________________International Journal of Optimization and Control-Theories & Applications-IJOCTA
Submitted on: 02 February 2000.
Revised on: 04 March 2000.
Accepted on: 29 April 2000.
___________________International Journal of Optimization and Control-Theories & Applications-IJOCTA
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