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Submitted on: 22 January 2019.
Revised on: 29 April 2019.
Accepted on: 31 May 2019.
___________________Contributions to Geophysics and Geodesy
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Submitted on: 15 May 2011.
Revised on: 03 September 2011.
Accepted on: 04 October 2011.
___________________Contributions to Geophysics and Geodesy
Submitted on: 14 April 1998.
Revised on: 05 June 1998.
Accepted on: 27 June 1998.
___________________Contributions to Geophysics and Geodesy
Submitted on: 02 January 2007.
Revised on: 17 April 2007.
Accepted on: 05 June 2007.
___________________Contributions to Geophysics and Geodesy
Submitted on: 27 March 1998.
Revised on: 17 July 1998.
Accepted on: 09 September 1998.
___________________Contributions to Geophysics and Geodesy