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Submitted on: 20 August 2012.
Revised on: 23 September 2012.
Accepted on: 08 October 2012.
___________________Journal of Mining and Metallurgy Section B-Metallurgy
Submitted on: 14 December 2001.
Revised on: 27 January 2002.
Accepted on: 07 February 2002.
___________________Journal of Mining and Metallurgy Section B-Metallurgy
Submitted on: 15 January 2010.
Revised on: 11 February 2010.
Accepted on: 16 March 2010.
___________________Journal of Mining and Metallurgy Section B-Metallurgy
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Submitted on: 21 May 1999.
Revised on: 05 August 1999.
Accepted on: 22 September 1999.
___________________Journal of Mining and Metallurgy Section B-Metallurgy