Submitted on: 08 November 1998.
Revised on: 27 January 1999.
Accepted on: 01 March 1999.
___________________JOURNAL OF ENVIRONMENTAL ENGINEERING
Submitted on: 28 May 2000.
Revised on: 09 August 2000.
Accepted on: 27 August 2000.
___________________JOURNAL OF ENVIRONMENTAL ENGINEERING
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Submitted on: 08 July 2012.
Revised on: 30 October 2012.
Accepted on: 26 December 2012.
___________________JOURNAL OF ENVIRONMENTAL ENGINEERING