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Submitted on: 11 January 1999.
Revised on: 10 March 1999.
Accepted on: 12 April 1999.
___________________Fuzzy Information and Engineering
Submitted on: 22 December 2011.
Revised on: 22 March 2012.
Accepted on: 01 May 2012.
___________________Fuzzy Information and Engineering
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Submitted on: 15 September 2019.
Revised on: 21 October 2019.
Accepted on: 12 November 2019.
___________________Fuzzy Information and Engineering
Submitted on: 30 January 2008.
Revised on: 30 March 2008.
Accepted on: 17 May 2008.
___________________Fuzzy Information and Engineering