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Submitted on: 31 October 2006.
Revised on: 01 December 2006.
Accepted on: 20 December 2006.
Transactions on Emerging Telecommunications Technologies
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Submitted on: 16 September 2007.
Revised on: 25 October 2007.
Accepted on: 01 November 2007.
Transactions on Emerging Telecommunications Technologies
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