1. Beutler G, Kouba J, Springer T (1995) Combining the orbits of the IGS Analysis Centers. Bulletin Géodésique, 69:200–222.
2. Hairville DA (1997) Matrix Algebra from a Statistician’s Perspective. Springer-Verlag, New York.
3. Knudsen P (1993) Altimetry for geodesy and oceanography. In Lecture notes for the NKG-Autumn School 1992 (J. Kakkuri, ed.): “Geodesy and Geophysics”, Report of the Finnish Geodetic Institute, No. 115, pp. 87–130, Helsinki.
4. Kouba J, Mireault Y, Lahaye F (1995) IGS Orbit/Clock Combination and Evaluation (Appendix I of the Analysis Coordinator Report), International GPS Service for Geodynamics (IGS) 1994 Annual Report, pp. 70–94.
5. Kotsakis C (2003) Some remarks on the integrated statistical processing of GPS, levelling and geoid data (in preparation).