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Submitted on: 20 August 2008.
Revised on: 06 October 2008.
Accepted on: 25 October 2008.
___________________INTERNATIONAL JOURNAL OF ENVIRONMENT AND POLLUTION
Submitted on: 08 March 1998.
Revised on: 26 May 1998.
Accepted on: 05 July 1998.
___________________INTERNATIONAL JOURNAL OF ENVIRONMENT AND POLLUTION
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Submitted on: 02 July 2012.
Revised on: 04 October 2012.
Accepted on: 01 December 2012.
___________________INTERNATIONAL JOURNAL OF ENVIRONMENT AND POLLUTION
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