1. Allan RR (1971) Resonant effect in inclination for close satellites. Royal Aircraft Establ Techn Rep 71245, Farnborough, Hants; see also similar paper in Planet Space Sci (1973) 21:205–225
2. Bettadpur S, Poole S, Ries J (2004) GRACE mission status and gravity field product improvement plans; paper G23-A01, AGU Fall Meeting 2004
3. Bettadpur S (2006) Status of re-processed GRACE gravity field data products, EGU Vienna. Geophys Res Abstracts 8: 01563
4. Bezděk A (2004) Semianalytic theory of motion for LEO satellites under air drag. In: Proceedings of the 18th Interntl Symp on Space Flight Dynamics, Munich, Germany, 11–15 Oct., ESA SP-548, pp 615–620
5. Bezděk A (2006) Prediction of the orbital evolution for LEO geodetic satellites. In: Proceedings of the Fifth International Symposium. Turkish-German Joint Geodetic Days, Berlin, 28–31 March