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2. Klokočník J., Reigber Ch., Kostelecký J. and Muller H., 1989: Covariance Propagation for GEM-L2 and GRIM 3M1P to TOPEX and ERS-1 Orbits.Deutsche Geod. Komm. Bayer Akad. Wiss. München, Reihe B,289, pp. 22 pages.
3. Klokočník J., Wagner C.A. and Kobrle F., 1992: A test of GEM T2 from GEOSAT Crossovers using Latitude Lumped Coefficients. In: H. Montag and Ch. Reigber (Eds),Proceedings IAG Symp. 112, Springer Verlag, 79–82.
4. Klokočník J., Kostelecký J. and Jandová M., 1993: Altimetry with Dual-Satellite Crossovers.IAG GM Beijing, China, Session D10: "Impact of satellite Altimetry on Gravity Field Determination" (see also 1995,Manuscr. Geod. 20, 82).
5. Klokočník J. and Wagner C.A., 1994: A test of GEM T2 from GEOSAT Crossovers using Latitude Lumped Coefficients.Bull. Geod. 68, 100.