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Submitted on: 21 May 2020.
Revised on: 01 September 2020.
Accepted on: 22 October 2020.
___________________International Journal of Coal Science & Technology
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Submitted on: 24 December 2005.
Revised on: 09 March 2006.
Accepted on: 17 April 2006.
___________________International Journal of Coal Science & Technology
Submitted on: 18 September 2010.
Revised on: 01 December 2010.
Accepted on: 25 January 2011.
___________________International Journal of Coal Science & Technology