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Submitted on: 01 January 2012.
Revised on: 25 April 2012.
Accepted on: 14 June 2012.
___________________COMPUTER JOURNAL---OXFORD UNIV PRESS
Submitted on: 15 April 2004.
Revised on: 12 May 2004.
Accepted on: 27 May 2004.
___________________COMPUTER JOURNAL---OXFORD UNIV PRESS
Submitted on: 22 June 2012.
Revised on: 28 August 2012.
Accepted on: 24 October 2012.
___________________COMPUTER JOURNAL---OXFORD UNIV PRESS
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Submitted on: 09 August 2002.
Revised on: 14 November 2002.
Accepted on: 02 December 2002.
___________________COMPUTER JOURNAL---OXFORD UNIV PRESS