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Submitted on: 25 July 2018.
Revised on: 11 October 2018.
Accepted on: 31 October 2018.
___________________International Journal of Oil Gas and Coal Technology
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Submitted on: 20 June 2007.
Revised on: 09 September 2007.
Accepted on: 10 October 2007.
___________________International Journal of Oil Gas and Coal Technology