1. Transformation from spatial to geographical coordinates;Bowring;Survey Review,1976
2. Sur l'adoption d'une formule internationale pour la pésanteur normale;Cassinis;Bulletin Géodésique,1930
3. Modern geodetic Earth reference models;Chovitz;EOS—Transactions of the American Geophysical Union,1981
4. Defense Mapping Agency (1987) Department of Defense World Geodetic System 1984: its definition and relationships with local geodetic systems. Technical Report 8350.2, Department of Defense, Washington, variously paged
5. Gravity corrections for the influence of the atmosphere;Ecker;Bollettino di Geofisica Teoretica et Applicata,1969