1. Blaha G (1991): Satellite-to-Satellite Tracking in the High-Low Mode: Line-of-Sight Acceleration in a Residual Gravity Field. PL-TR-91-2209, Phillips Laboratory (AFSC), Hanscom AFB, MA.
2. Carson L (1990): Preliminary Experimental Performance of the TOPEX Global Positioning System Demonstration Receiver (GPSDR). In: Proceedings of the Second Symposium on GPS Applications in Space, C. Jekeli (ed.), Report GL-TR-90-0032, Volume II, Geophysics Laboratory, Hanscom AFB, MA.
3. de Boor C (1978):A Practical Guide to Splines. Springer-Verlag, New York.
4. Eissfeller B, Spietz P (1989): Basic Filter Concepts for the Integration of GPS and an Inertial Ring Laser Gyro Strapdown System.Manus. Geodaetica,14, 166?182.
5. Hajela DP (1978): Improved Procedures for the Recovery of 5° Mean Gravity Anomalies from ATS-6/GEOS-3 Satellite to Satellite Range-Rate Observations Using Least Squares Collocation. Report No. 276,Department of Geodetic Science, Ohio State University, Report AFGL-TR-78-0260, Air Force Geophys. Lab., Hanscom AFB, MA.