Submitted on: 08 November 2017.
Revised on: 03 January 2018.
Accepted on: 11 February 2018.
___________________ECOLOGICAL ECONOMICS---ELSEVIER
Submitted on: 07 April 2018.
Revised on: 23 June 2018.
Accepted on: 11 August 2018.
___________________ECOLOGICAL ECONOMICS---ELSEVIER
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Submitted on: 09 August 2004.
Revised on: 05 October 2004.
Accepted on: 28 November 2004.
___________________ECOLOGICAL ECONOMICS---ELSEVIER
Submitted on: 10 February 1998.
Revised on: 28 May 1998.
Accepted on: 14 July 1998.
___________________ECOLOGICAL ECONOMICS---ELSEVIER
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