1. Instrument of GRACE: GPS augments gravity measurements;Dunn;GPS World,2003
2. Error analysis of a low-low satellite-to-satellite tracking mission;Kim;AIAA J.,2002
3. Lemoine , F. 1998 The development of the joint NASA GSFC and NIMA geopotential model EGM96 Rep. TM 1998 206861 NASA Greenbelt, MD
4. New error calibration tests for gravity models using subset solutions and independent data: Applied to GEM-T3;Lerch;Geophys. Res. Lett.,1993
5. The CHAMP geopotential mission;Reigber;Bol. Geofis. Teor. Appl.,1999