Rapp, R.H. External Organizations; Publikationen aller ICGEM-unterstützten Projekte, Deutsches GeoForschungsZentrum;
Cruz, J.Y. External Organizations; Publikationen aller ICGEM-unterstützten Projekte, Deutsches GeoForschungsZentrum;
Rapp, R., Cruz, J. (1986): Spherical Harmonic Expansion of the Earth's Gravitational Potential to Degree 360 Using 30' Mean Anomalies, (Reports of the Department of Geodetic Science and Surveying ; 376), Columbus, Oh : The Ohio State University, Department of Geodetic Science, 22 p.