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Submitted on: 11 July 2006.
Revised on: 23 August 2006.
Accepted on: 21 September 2006.
___________________Applied Computing Review---ASSOC COMPUTING MACHINERY
Submitted on: 18 December 2006.
Revised on: 12 April 2007.
Accepted on: 04 May 2007.
___________________Applied Computing Review---ASSOC COMPUTING MACHINERY
Submitted on: 23 January 2009.
Revised on: 12 March 2009.
Accepted on: 27 April 2009.
___________________Applied Computing Review---ASSOC COMPUTING MACHINERY
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