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Submitted on: 16 August 2000.
Revised on: 23 November 2000.
Accepted on: 05 January 2001.
___________________International Journal of Minerals Metallurgy and Materials
Submitted on: 28 February 2008.
Revised on: 29 March 2008.
Accepted on: 16 April 2008.
___________________International Journal of Minerals Metallurgy and Materials
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Submitted on: 20 January 2008.
Revised on: 17 April 2008.
Accepted on: 12 May 2008.
___________________International Journal of Minerals Metallurgy and Materials
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