Submitted on: 31 March 2001.
Revised on: 05 July 2001.
Accepted on: 24 July 2001.
___________________INTERNATIONAL JOURNAL OF SYSTEMS SCIENCE
http://reply.papertrans.cn/2/143/14205/14205-12.png
http://reply.papertrans.cn/2/143/14205/14205-13.png
http://reply.papertrans.cn/2/143/14205/14205-14.png
http://reply.papertrans.cn/2/143/14205/14205-15.png
http://reply.papertrans.cn/2/143/14205/14205-16.png
http://reply.papertrans.cn/2/143/14205/14205-17.png
Submitted on: 26 June 1999.
Revised on: 21 October 1999.
Accepted on: 15 December 1999.
___________________INTERNATIONAL JOURNAL OF SYSTEMS SCIENCE
Submitted on: 31 October 2011.
Revised on: 16 December 2011.
Accepted on: 24 January 2012.
___________________INTERNATIONAL JOURNAL OF SYSTEMS SCIENCE
Submitted on: 02 March 2001.
Revised on: 29 April 2001.
Accepted on: 17 June 2001.
___________________INTERNATIONAL JOURNAL OF SYSTEMS SCIENCE