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Submitted on: 30 May 2020.
Revised on: 28 August 2020.
Accepted on: 08 October 2020.
___________________Environmental Earth Sciences---SPRINGER
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Submitted on: 11 March 2015.
Revised on: 02 June 2015.
Accepted on: 19 June 2015.
___________________Environmental Earth Sciences---SPRINGER
Submitted on: 13 March 2013.
Revised on: 19 April 2013.
Accepted on: 29 May 2013.
___________________Environmental Earth Sciences---SPRINGER