Submitted on: 09 October 2002.
Revised on: 29 November 2002.
Accepted on: 21 December 2002.
___________________Journal of Hydro-environment Research
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Submitted on: 20 June 1999.
Revised on: 01 August 1999.
Accepted on: 29 September 1999.
___________________Journal of Hydro-environment Research
Submitted on: 07 November 2012.
Revised on: 17 January 2013.
Accepted on: 08 February 2013.
___________________Journal of Hydro-environment Research
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Submitted on: 16 April 2006.
Revised on: 14 July 2006.
Accepted on: 17 August 2006.
___________________Journal of Hydro-environment Research
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