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Submitted on: 28 February 2007.
Revised on: 21 April 2007.
Accepted on: 08 May 2007.
___________________Journal of Grid Computing---SPRINGER
Submitted on: 19 December 2006.
Revised on: 25 January 2007.
Accepted on: 13 February 2007.
___________________Journal of Grid Computing---SPRINGER
Submitted on: 02 July 2015.
Revised on: 13 September 2015.
Accepted on: 15 October 2015.
___________________Journal of Grid Computing---SPRINGER
Submitted on: 17 June 2003.
Revised on: 09 September 2003.
Accepted on: 02 November 2003.
___________________Journal of Grid Computing---SPRINGER
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