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Submitted on: 21 June 2017.
Revised on: 01 August 2017.
Accepted on: 14 August 2017.
___________________Journal of Engineering and Technological Sciences
Submitted on: 18 September 2017.
Revised on: 14 January 2018.
Accepted on: 26 February 2018.
___________________Journal of Engineering and Technological Sciences
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Submitted on: 15 November 2005.
Revised on: 26 February 2006.
Accepted on: 12 April 2006.
___________________Journal of Engineering and Technological Sciences