http://reply.papertrans.cn/2/116/11559/11559-31.png
Submitted on: 25 March 2003.
Revised on: 17 May 2003.
Accepted on: 20 June 2003.
___________________HUMAN ECOLOGY---SPRINGER/PLENUM PUBLISHERS
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Submitted on: 30 September 2015.
Revised on: 06 November 2015.
Accepted on: 15 December 2015.
___________________HUMAN ECOLOGY---SPRINGER/PLENUM PUBLISHERS
Submitted on: 30 November 2015.
Revised on: 26 February 2016.
Accepted on: 22 March 2016.
___________________HUMAN ECOLOGY---SPRINGER/PLENUM PUBLISHERS
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