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Submitted on: 04 April 1998.
Revised on: 12 May 1998.
Accepted on: 01 June 1998.
___________________Journal of Engineering---HINDAWI LTD
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Submitted on: 01 October 2008.
Revised on: 26 January 2009.
Accepted on: 28 February 2009.
___________________Journal of Engineering---HINDAWI LTD
Submitted on: 08 May 2017.
Revised on: 13 July 2017.
Accepted on: 31 July 2017.
___________________Journal of Engineering---HINDAWI LTD
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Submitted on: 17 July 2018.
Revised on: 06 September 2018.
Accepted on: 17 September 2018.
___________________Journal of Engineering---HINDAWI LTD
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