1) Vanícek, P. and E.J. Krakiwsky (1986). Geodesy: The concepts. North-Holland editors, Amsterdam, Holland,2nd ed.2) Seeber, G. (2003). Satelite Geodesy. De Gruyter, 2nd Edition.3) Rapp, R.H. (1984). Geometric Geodesy. Part I. Ohio State University.4) Mueller, I.I. (1969). Spherical and Practical Astronomy as Applied to Geodesy. Frederick Ungar PublishingCo., New York5) Seidelmann, P.K. (Ed.) (1992). Explanatory Supplement to the Astronomical Almanac. U.S. NavalObservatory, Washingtom, D.C.: