Submitted on: 19 May 2016.
Revised on: 09 August 2016.
Accepted on: 19 September 2016.
___________________DATA & KNOWLEDGE ENGINEERING---ELSEVIER
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Submitted on: 14 August 2012.
Revised on: 09 December 2012.
Accepted on: 29 January 2013.
___________________DATA & KNOWLEDGE ENGINEERING---ELSEVIER
Submitted on: 20 September 2003.
Revised on: 07 November 2003.
Accepted on: 24 December 2003.
___________________DATA & KNOWLEDGE ENGINEERING---ELSEVIER
Submitted on: 14 April 2013.
Revised on: 03 August 2013.
Accepted on: 16 August 2013.
___________________DATA & KNOWLEDGE ENGINEERING---ELSEVIER
Submitted on: 20 April 2016.
Revised on: 03 August 2016.
Accepted on: 23 August 2016.
___________________DATA & KNOWLEDGE ENGINEERING---ELSEVIER
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Submitted on: 28 May 1999.
Revised on: 04 August 1999.
Accepted on: 13 September 1999.
___________________DATA & KNOWLEDGE ENGINEERING---ELSEVIER
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