Rapp, Richard H. Publikationen aller ICGEM-unterstützten Projekte, Deutsches GeoForschungsZentrum;
Rapp, R. H. (1968): Gravitational potential of the Earth determined from a combination of satellite, observed, and model anomalies. - Journal of Geophysical Research, 73, 20, 6555-6562.https://doi.org/10.1029/JB073i020p06555