Submitted on: 23 February 1998.
Revised on: 13 June 1998.
Accepted on: 26 June 1998.
___________________International Journal of Coal Science & Technology
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Submitted on: 15 May 2013.
Revised on: 05 August 2013.
Accepted on: 19 August 2013.
___________________International Journal of Coal Science & Technology
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Submitted on: 06 January 2002.
Revised on: 13 February 2002.
Accepted on: 16 March 2002.
___________________International Journal of Coal Science & Technology