1. Fadell, A. G., , Vector calculus and differential equations, D. Van Norstrand, Princeton, N.J., 1968,
2. Heiskanen, W. A., , H., Moritz, , Physical geodesy, W. H. Freeman & Co., 1967,
3. Kellogg, O. D., , Foundations of potential theory, Fr. Ungar Publishing Co., New York, 1929,
4. Molodensky, , , Methods for the Study of the External Gravitational Field of the Earth, Transl. from Russian Israel Program for Scientific Translations, Jerusalem, 1962,
5. Direct integration of Stokes' undulation and Vening Meinesz deflection equations for geographically-defined gravity anomaly blocks;Obenson;Ann. Fac. Sci. Yaounde,1980