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Submitted on: 12 January 2002.
Revised on: 06 May 2002.
Accepted on: 25 May 2002.
___________________JOURNAL OF GEODESY---SPRINGER
Submitted on: 25 March 2001.
Revised on: 19 May 2001.
Accepted on: 14 June 2001.
___________________JOURNAL OF GEODESY---SPRINGER
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Submitted on: 17 June 2017.
Revised on: 07 August 2017.
Accepted on: 20 September 2017.
___________________JOURNAL OF GEODESY---SPRINGER
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