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Submitted on: 27 January 2013.
Revised on: 16 May 2013.
Accepted on: 25 June 2013.
___________________ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
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Submitted on: 09 November 2008.
Revised on: 31 December 2008.
Accepted on: 10 January 2009.
___________________ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
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