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Submitted on: 17 August 1999.
Revised on: 11 September 1999.
Accepted on: 03 October 1999.
Water Resources and Economics---ELSEVIER
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Submitted on: 23 October 2000.
Revised on: 04 November 2000.
Accepted on: 26 November 2000.
Water Resources and Economics---ELSEVIER
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Submitted on: 23 October 2023.
Revised on: 20 November 2023.
Accepted on: 29 November 2023.
Water Resources and Economics---ELSEVIER