1. Arabelos, D., , Untersuchungen zur gravimetrischen Geoidbestimmung, dargestellt am Testgebiet Griechenland, Wissenchaftliche Arbeiten, Fachrichtung Vermess. der Univ. Hannover, Hannover, West Germany, 1980,
2. Torsion balance observations in southwest Ohio;Badekas,1967
3. Interpolation of the vertical deflection from horizontal gravity gradients;Badekas;J. Geophys. Res.,1968
4. A study of terrain reductions, density anomalies and geophysical inversion methods in gravity field modelling;Forsberg,1984
5. Gravity empirical covariance values for the continental United States;Goad;J. Geophys. Res.,1984