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Submitted on: 01 November 2004.
Revised on: 09 January 2005.
Accepted on: 31 January 2005.
___________________International Journal of Oil Gas and Coal Technology
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Submitted on: 22 October 2020.
Revised on: 25 January 2021.
Accepted on: 20 February 2021.
___________________International Journal of Oil Gas and Coal Technology
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