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Submitted on: 21 March 1999.
Revised on: 08 June 1999.
Accepted on: 06 July 1999.
___________________ADVANCES IN POLYMER TECHNOLOGY
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Submitted on: 19 December 2011.
Revised on: 05 March 2012.
Accepted on: 17 April 2012.
___________________ADVANCES IN POLYMER TECHNOLOGY