Submitted on: 01 August 2006.
Revised on: 26 August 2006.
Accepted on: 22 September 2006.
___________________Frontiers of Earth Science---SPRINGER
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Submitted on: 08 November 2016.
Revised on: 02 February 2017.
Accepted on: 13 February 2017.
___________________Frontiers of Earth Science---SPRINGER
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