Submitted on: 07 August 1999.
Revised on: 10 September 1999.
Accepted on: 18 September 1999.
Water Quality Research Journal
Submitted on: 22 March 2001.
Revised on: 05 April 2001.
Accepted on: 26 April 2001.
Water Quality Research Journal
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Submitted on: 14 September 2007.
Revised on: 24 September 2007.
Accepted on: 13 October 2007.
Water Quality Research Journal
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Submitted on: 12 May 2013.
Revised on: 16 June 2013.
Accepted on: 06 July 2013.
Water Quality Research Journal