1. New geodetic parameters for a standard earth (abstract;Gaposchkin;Eos Trans. AGU,1969
2. E. M. Gaposchkin K. Lambeck 1969 Smithsonian standard earth (II) Smithson. Astrophys. Observ. Spec. Rep. 315 1970
3. Tests and comparisons of gravity models;Marsh;Celestial Mechanics,1971
4. NASA Stadan, Speopt, and laser tracking station positions derived from Geos 1 and 2 precision reduced optical and laser observations;Marsh;Space Res.,1971