Submitted on: 18 November 1999.
Revised on: 09 March 2000.
Accepted on: 26 April 2000.
___________________ANNALS OF OPERATIONS RESEARCH---SPRINGER
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Submitted on: 12 February 2003.
Revised on: 02 May 2003.
Accepted on: 24 May 2003.
___________________ANNALS OF OPERATIONS RESEARCH---SPRINGER
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Submitted on: 23 August 2005.
Revised on: 25 September 2005.
Accepted on: 26 October 2005.
___________________ANNALS OF OPERATIONS RESEARCH---SPRINGER
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Submitted on: 02 May 2014.
Revised on: 24 August 2014.
Accepted on: 10 October 2014.
___________________ANNALS OF OPERATIONS RESEARCH---SPRINGER
Submitted on: 09 January 2010.
Revised on: 08 May 2010.
Accepted on: 16 June 2010.
___________________ANNALS OF OPERATIONS RESEARCH---SPRINGER