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Submitted on: 18 October 2020.
Revised on: 25 December 2020.
Accepted on: 24 January 2021.
___________________HUMAN ECOLOGY---SPRINGER/PLENUM PUBLISHERS
Submitted on: 30 March 1999.
Revised on: 06 June 1999.
Accepted on: 28 June 1999.
___________________HUMAN ECOLOGY---SPRINGER/PLENUM PUBLISHERS
Submitted on: 20 October 2018.
Revised on: 27 December 2018.
Accepted on: 10 January 2019.
___________________HUMAN ECOLOGY---SPRINGER/PLENUM PUBLISHERS
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