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Submitted on: 15 April 2006.
Revised on: 11 July 2006.
Accepted on: 05 August 2006.
___________________EUROPEAN POLYMER JOURNAL---PERGAMON-ELSEVIER SCIENCE LTD
Submitted on: 10 April 1999.
Revised on: 06 June 1999.
Accepted on: 20 June 1999.
___________________EUROPEAN POLYMER JOURNAL---PERGAMON-ELSEVIER SCIENCE LTD
Submitted on: 10 March 2006.
Revised on: 03 July 2006.
Accepted on: 26 August 2006.
___________________EUROPEAN POLYMER JOURNAL---PERGAMON-ELSEVIER SCIENCE LTD