Submitted on: 17 February 2016.
Revised on: 09 March 2016.
Accepted on: 13 April 2016.
___________________DATA & KNOWLEDGE ENGINEERING---ELSEVIER
Submitted on: 14 September 2019.
Revised on: 10 December 2019.
Accepted on: 23 December 2019.
___________________DATA & KNOWLEDGE ENGINEERING---ELSEVIER
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Submitted on: 20 December 2006.
Revised on: 04 April 2007.
Accepted on: 01 May 2007.
___________________DATA & KNOWLEDGE ENGINEERING---ELSEVIER
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