Submitted on: 13 December 2005.
Revised on: 25 January 2006.
Accepted on: 08 March 2006.
___________________International Journal of Coal Preparation and Utilization
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Submitted on: 28 March 2004.
Revised on: 02 May 2004.
Accepted on: 27 June 2004.
___________________International Journal of Coal Preparation and Utilization
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Submitted on: 10 October 2006.
Revised on: 17 November 2006.
Accepted on: 02 December 2006.
___________________International Journal of Coal Preparation and Utilization
Submitted on: 27 January 2014.
Revised on: 03 April 2014.
Accepted on: 27 April 2014.
___________________International Journal of Coal Preparation and Utilization
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Submitted on: 29 July 2003.
Revised on: 08 October 2003.
Accepted on: 12 November 2003.
___________________International Journal of Coal Preparation and Utilization
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