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Submitted on: 04 December 2002.
Revised on: 24 February 2003.
Accepted on: 28 March 2003.
___________________ECOLOGICAL ECONOMICS---ELSEVIER
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Submitted on: 20 October 2017.
Revised on: 14 December 2017.
Accepted on: 31 January 2018.
___________________ECOLOGICAL ECONOMICS---ELSEVIER
Submitted on: 01 November 2016.
Revised on: 28 January 2017.
Accepted on: 10 February 2017.
___________________ECOLOGICAL ECONOMICS---ELSEVIER
Submitted on: 04 April 2001.
Revised on: 19 June 2001.
Accepted on: 20 July 2001.
___________________ECOLOGICAL ECONOMICS---ELSEVIER
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