Submitted on: 09 February 2004.
Revised on: 20 May 2004.
Accepted on: 10 June 2004.
___________________INTERNATIONAL JOURNAL OF SYSTEMS SCIENCE
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Submitted on: 12 December 2010.
Revised on: 27 February 2011.
Accepted on: 05 April 2011.
___________________INTERNATIONAL JOURNAL OF SYSTEMS SCIENCE
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Submitted on: 14 July 2008.
Revised on: 01 September 2008.
Accepted on: 16 September 2008.
___________________INTERNATIONAL JOURNAL OF SYSTEMS SCIENCE
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Submitted on: 11 May 2006.
Revised on: 18 June 2006.
Accepted on: 22 July 2006.
___________________INTERNATIONAL JOURNAL OF SYSTEMS SCIENCE
Submitted on: 13 March 2001.
Revised on: 17 April 2001.
Accepted on: 25 May 2001.
___________________INTERNATIONAL JOURNAL OF SYSTEMS SCIENCE
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