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Submitted on: 19 May 2000.
Revised on: 27 June 2000.
Accepted on: 07 August 2000.
___________________Geodesy and Geodynamics---KEAI PUBLISHING LTD
Submitted on: 19 May 1999.
Revised on: 11 July 1999.
Accepted on: 16 August 1999.
___________________Geodesy and Geodynamics---KEAI PUBLISHING LTD
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Submitted on: 16 July 2005.
Revised on: 09 November 2005.
Accepted on: 25 December 2005.
___________________Geodesy and Geodynamics---KEAI PUBLISHING LTD
Submitted on: 17 April 2001.
Revised on: 15 July 2001.
Accepted on: 29 July 2001.
___________________Geodesy and Geodynamics---KEAI PUBLISHING LTD
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Submitted on: 20 August 2006.
Revised on: 03 November 2006.
Accepted on: 19 December 2006.
___________________Geodesy and Geodynamics---KEAI PUBLISHING LTD