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Submitted on: 13 February 2009.
Revised on: 24 March 2009.
Accepted on: 23 April 2009.
___________________HYDROLOGY AND EARTH SYSTEM SCIENCES
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Submitted on: 13 December 1998.
Revised on: 03 March 1999.
Accepted on: 27 April 1999.
___________________HYDROLOGY AND EARTH SYSTEM SCIENCES
Submitted on: 31 May 1999.
Revised on: 12 September 1999.
Accepted on: 29 September 1999.
___________________HYDROLOGY AND EARTH SYSTEM SCIENCES
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