Submitted on: 23 May 2004.
Revised on: 26 July 2004.
Accepted on: 12 September 2004.
___________________INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
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Submitted on: 02 January 2000.
Revised on: 30 April 2000.
Accepted on: 19 June 2000.
___________________INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
Submitted on: 19 August 2006.
Revised on: 25 November 2006.
Accepted on: 13 January 2007.
___________________INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS