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Submitted on: 22 June 2010.
Revised on: 10 September 2010.
Accepted on: 03 October 2010.
___________________Epitoanyag-Journal of Silicate Based and Composite Materials
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Submitted on: 26 October 1998.
Revised on: 07 February 1999.
Accepted on: 15 March 1999.
___________________Epitoanyag-Journal of Silicate Based and Composite Materials
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