Submitted on: 30 September 2007.
Revised on: 16 January 2008.
Accepted on: 18 February 2008.
___________________Journal of Optimization---HINDAWI LTD
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Submitted on: 28 December 2003.
Revised on: 02 April 2004.
Accepted on: 01 May 2004.
___________________Journal of Optimization---HINDAWI LTD
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Submitted on: 03 July 2002.
Revised on: 06 August 2002.
Accepted on: 29 September 2002.
___________________Journal of Optimization---HINDAWI LTD
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Submitted on: 23 February 2012.
Revised on: 05 June 2012.
Accepted on: 18 June 2012.
___________________Journal of Optimization---HINDAWI LTD
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Submitted on: 26 December 1998.
Revised on: 28 February 1999.
Accepted on: 23 March 1999.
___________________Journal of Optimization---HINDAWI LTD