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Submitted on: 25 December 2002.
Revised on: 05 January 2003.
Accepted on: 16 January 2003.
Sustainable Environment Research
Submitted on: 20 March 2012.
Revised on: 22 April 2012.
Accepted on: 07 May 2012.
Sustainable Environment Research
Submitted on: 10 September 2004.
Revised on: 11 October 2004.
Accepted on: 27 October 2004.
Sustainable Environment Research
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Submitted on: 06 April 2016.
Revised on: 16 April 2016.
Accepted on: 11 May 2016.
Sustainable Environment Research