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Submitted on: 03 November 2004.
Revised on: 22 February 2005.
Accepted on: 25 March 2005.
___________________JOURNAL OF AQUATIC PLANT MANAGEMENT
Submitted on: 09 May 2011.
Revised on: 30 July 2011.
Accepted on: 15 September 2011.
___________________JOURNAL OF AQUATIC PLANT MANAGEMENT
Submitted on: 20 January 2004.
Revised on: 25 April 2004.
Accepted on: 13 May 2004.
___________________JOURNAL OF AQUATIC PLANT MANAGEMENT