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Submitted on: 19 January 2016.
Revised on: 26 March 2016.
Accepted on: 16 April 2016.
___________________IIUM Engineering Journal---KULLIYYAH ENGINEERING
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Submitted on: 31 August 2017.
Revised on: 13 December 2017.
Accepted on: 23 January 2018.
___________________IIUM Engineering Journal---KULLIYYAH ENGINEERING
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Submitted on: 20 July 2014.
Revised on: 24 October 2014.
Accepted on: 18 November 2014.
___________________IIUM Engineering Journal---KULLIYYAH ENGINEERING
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