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Submitted on: 27 February 1998.
Revised on: 18 June 1998.
Accepted on: 26 July 1998.
___________________Journal of the Operations Research Society of China
Submitted on: 07 December 2001.
Revised on: 19 January 2002.
Accepted on: 10 February 2002.
___________________Journal of the Operations Research Society of China
Submitted on: 03 July 2018.
Revised on: 13 August 2018.
Accepted on: 11 October 2018.
___________________Journal of the Operations Research Society of China
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Submitted on: 04 September 2021.
Revised on: 06 November 2021.
Accepted on: 05 January 2022.
___________________Journal of the Operations Research Society of China
Submitted on: 20 February 2012.
Revised on: 05 June 2012.
Accepted on: 16 June 2012.
___________________Journal of the Operations Research Society of China