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Submitted on: 21 March 2009.
Revised on: 21 May 2009.
Accepted on: 11 June 2009.
___________________Inzynieria Mineralna-Journal of the Polish Mineral Engineering Society
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Submitted on: 24 October 2005.
Revised on: 22 January 2006.
Accepted on: 12 March 2006.
___________________Inzynieria Mineralna-Journal of the Polish Mineral Engineering Society
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Submitted on: 24 April 2001.
Revised on: 13 June 2001.
Accepted on: 11 July 2001.
___________________Inzynieria Mineralna-Journal of the Polish Mineral Engineering Society
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