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Submitted on: 31 March 2017.
Revised on: 13 June 2017.
Accepted on: 03 July 2017.
___________________ENVIRONMENTAL & RESOURCE ECONOMICS
Submitted on: 13 May 1998.
Revised on: 20 June 1998.
Accepted on: 15 July 1998.
___________________ENVIRONMENTAL & RESOURCE ECONOMICS
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Submitted on: 16 May 2012.
Revised on: 08 June 2012.
Accepted on: 25 July 2012.
___________________ENVIRONMENTAL & RESOURCE ECONOMICS
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