Submitted on: 27 April 2017.
Revised on: 12 August 2017.
Accepted on: 20 September 2017.
___________________Environmental Earth Sciences---SPRINGER
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Submitted on: 03 September 2002.
Revised on: 25 December 2002.
Accepted on: 09 January 2003.
___________________Environmental Earth Sciences---SPRINGER
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Submitted on: 09 July 2016.
Revised on: 01 August 2016.
Accepted on: 21 September 2016.
___________________Environmental Earth Sciences---SPRINGER
Submitted on: 05 June 2006.
Revised on: 30 September 2006.
Accepted on: 29 October 2006.
___________________Environmental Earth Sciences---SPRINGER
Submitted on: 28 August 2017.
Revised on: 11 December 2017.
Accepted on: 26 December 2017.
___________________Environmental Earth Sciences---SPRINGER
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