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Submitted on: 24 July 1999.
Revised on: 05 October 1999.
Accepted on: 02 December 1999.
___________________International Journal of Smart and Nano Materials
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Submitted on: 24 June 2002.
Revised on: 04 September 2002.
Accepted on: 02 October 2002.
___________________International Journal of Smart and Nano Materials
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Submitted on: 04 March 2014.
Revised on: 31 March 2014.
Accepted on: 26 April 2014.
___________________International Journal of Smart and Nano Materials