Submitted on: 26 June 2010.
Revised on: 15 August 2010.
Accepted on: 24 September 2010.
___________________Green Materials---EMERALD GROUP PUBLISHING LTD
Submitted on: 31 December 2005.
Revised on: 02 April 2006.
Accepted on: 26 May 2006.
___________________Green Materials---EMERALD GROUP PUBLISHING LTD
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Submitted on: 27 October 2006.
Revised on: 16 January 2007.
Accepted on: 28 January 2007.
___________________Green Materials---EMERALD GROUP PUBLISHING LTD
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Submitted on: 31 August 2006.
Revised on: 04 November 2006.
Accepted on: 27 December 2006.
___________________Green Materials---EMERALD GROUP PUBLISHING LTD
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