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Submitted on: 08 March 2002.
Revised on: 12 April 2002.
Accepted on: 11 June 2002.
___________________Express Polymer Letters---BUDAPEST UNIV TECHNOL & ECON
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Submitted on: 18 June 2004.
Revised on: 06 October 2004.
Accepted on: 23 October 2004.
___________________Express Polymer Letters---BUDAPEST UNIV TECHNOL & ECON
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Submitted on: 02 December 2004.
Revised on: 22 December 2004.
Accepted on: 11 January 2005.
___________________Express Polymer Letters---BUDAPEST UNIV TECHNOL & ECON
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