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2. R. Fitzpatrick: An Introduction to Celestial Mechanics (Cambridge Univ. Press, Cambridge 2012)
3. W. Gellert, S. Gottwald, M. Hellwich, H. Kästner, H. Küstner: The VNR Concise Encyclopedia of Mathematics, 2nd edn. (Van Nostrand Reinhold, New York 1989)
4. D.A. Vallado: Fundamentals of Astrodynamics and Applications, 2nd edn. (Kluwer Academic, Dordrecht 2001)
5. O. Montenbruck, E. Gill: Satellite Orbits – Models, Methods and Applications (Springer, Berlin 2000)