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Submitted on: 24 November 2007.
Revised on: 29 February 2008.
Accepted on: 05 April 2008.
___________________Frontiers of Earth Science---SPRINGER
Submitted on: 30 December 2017.
Revised on: 20 February 2018.
Accepted on: 03 April 2018.
___________________Frontiers of Earth Science---SPRINGER
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Submitted on: 11 September 2019.
Revised on: 29 December 2019.
Accepted on: 22 January 2020.
___________________Frontiers of Earth Science---SPRINGER
Submitted on: 20 August 2007.
Revised on: 27 September 2007.
Accepted on: 31 October 2007.
___________________Frontiers of Earth Science---SPRINGER
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