Referencias
W.A. HEISKANEN, and H. MORITZ (1967): Physical Geodesy. W.H. Freeman, San Francisco.
International Association of Geodesy (1971): Geodetic Reference System 1967. Publi. Spéc. n° 3 du Bulletin Géodésique, Paris.
H. MORITZ (1979): Report of Special Study Group N° 539 of I.A.G., Fundamental Geodetic Constants, presented at XVII General Assembly og I.U.G.G., Canberra.