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Submitted on: 10 September 2016.
Revised on: 01 December 2016.
Accepted on: 20 January 2017.
___________________Acta Geodaetica et Geophysica---SPRINGER
Submitted on: 10 January 2021.
Revised on: 27 February 2021.
Accepted on: 25 April 2021.
___________________Acta Geodaetica et Geophysica---SPRINGER
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Submitted on: 22 April 1998.
Revised on: 09 June 1998.
Accepted on: 26 June 1998.
___________________Acta Geodaetica et Geophysica---SPRINGER
Submitted on: 09 May 2016.
Revised on: 30 June 2016.
Accepted on: 17 August 2016.
___________________Acta Geodaetica et Geophysica---SPRINGER
Submitted on: 16 December 2020.
Revised on: 28 January 2021.
Accepted on: 21 February 2021.
___________________Acta Geodaetica et Geophysica---SPRINGER
Submitted on: 08 May 2008.
Revised on: 15 June 2008.
Accepted on: 03 July 2008.
___________________Acta Geodaetica et Geophysica---SPRINGER