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Submitted on: 04 May 2007.
Revised on: 11 June 2007.
Accepted on: 13 July 2007.
___________________Epitoanyag-Journal of Silicate Based and Composite Materials
Submitted on: 04 June 2005.
Revised on: 19 July 2005.
Accepted on: 12 September 2005.
___________________Epitoanyag-Journal of Silicate Based and Composite Materials
Submitted on: 12 December 2000.
Revised on: 24 January 2001.
Accepted on: 21 February 2001.
___________________Epitoanyag-Journal of Silicate Based and Composite Materials
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