Submitted on: 29 May 2013.
Revised on: 12 September 2013.
Accepted on: 17 October 2013.
___________________Journal of the Operations Research Society of China
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Submitted on: 02 February 2011.
Revised on: 19 April 2011.
Accepted on: 29 May 2011.
___________________Journal of the Operations Research Society of China
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Submitted on: 12 August 2007.
Revised on: 02 October 2007.
Accepted on: 24 October 2007.
___________________Journal of the Operations Research Society of China
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Submitted on: 01 July 2024.
Revised on: 27 September 2024.
Accepted on: 07 October 2024.
___________________Journal of the Operations Research Society of China