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Submitted on: 05 October 2009.
Revised on: 22 December 2009.
Accepted on: 26 January 2010.
___________________International Journal of Minerals Metallurgy and Materials
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Submitted on: 20 October 2020.
Revised on: 13 December 2020.
Accepted on: 10 February 2021.
___________________International Journal of Minerals Metallurgy and Materials
Submitted on: 02 June 2004.
Revised on: 15 July 2004.
Accepted on: 11 September 2004.
___________________International Journal of Minerals Metallurgy and Materials
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Submitted on: 22 October 2010.
Revised on: 01 February 2011.
Accepted on: 27 March 2011.
___________________International Journal of Minerals Metallurgy and Materials