Rapp, R.H. External Organizations; Publikationen aller ICGEM-unterstützten Projekte, Deutsches GeoForschungsZentrum;
Rapp, R. (1973): Numerical Results from the Combination of Gravimetric and Satellite Data Using the Principles of Least Squares Collocation, (Reports of the Department of Geodetic Science and Surveying), Columbus, Oh : The Ohio State University, Department of Geodetic Science, 58 p.