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Submitted on: 20 July 2009.
Revised on: 08 October 2009.
Accepted on: 24 November 2009.
___________________JOURNAL OF ENGINEERING MATHEMATICS
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Submitted on: 03 December 2006.
Revised on: 03 January 2007.
Accepted on: 23 January 2007.
___________________JOURNAL OF ENGINEERING MATHEMATICS
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Submitted on: 07 September 2017.
Revised on: 22 November 2017.
Accepted on: 10 January 2018.
___________________JOURNAL OF ENGINEERING MATHEMATICS
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