- Szebehely, Theory of Orbits.
 - Battin, An Introduction to the Mathematics and Methods
    of Astrodynamics, Revised Edition, AIAA education
    series, 1999.
 - El llibre KoLoMaRoss de http://www.esm.vt.edu/~sdross/books/
    (dibuix del potencial)
 - Danby, Fundamentals of Celestial Mechanics
    (dibuixos 3D tan macos de la funci?? Omega).