1. Bracewell RN (1986) The Fourier transform and its applications, 2nd edn., revised. McGraw-Hill, New York.
2. Colombo OL (1981) Numerical methods for harmonic analysis on the sphere. Report no. 310, Dept. of Geodetic Science and Surveying, The Ohio State University.
3. Forsberg R, Kearsley AHW (1990) Precise gravimetric geoid computations over large regions in: Brunner FK, Rizos C (eds), Developments in Four-Dimensional Geodesy. Springer Verlag, pp 65–82.
4. Heiskanen WA, Moritz H (1967) Physical Geodesy. W.H.Freeman and Company.
5. Jordan SK (1978) Fourier physical geodesy. Report No. AFGL-TR-78-0056, The Analytic Sciences Corp., Reading, Massachusetts.