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Submitted on: 03 October 2003.
Revised on: 31 October 2003.
Accepted on: 10 December 2003.
___________________JOURNAL OF AQUATIC PLANT MANAGEMENT
Submitted on: 15 February 2009.
Revised on: 27 April 2009.
Accepted on: 05 June 2009.
___________________JOURNAL OF AQUATIC PLANT MANAGEMENT
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