1. Baker, R. M. L., Jr.: 1966, inTrajectories of Artificial Celestial Bodies, ed. by J. Kovalevsky, Springer-Verlag, Berlin, p. 85.
2. Hall, N. M. and Cherniack, J. R.: 1969,Smithsonian Package for Algebra and Symbolic Mathematics, Smithsonian Astrophys. Obs. Spec. Rep. No. 291.
3. Lochry, R. R.: 1966, Ph.D. Dissertation, Univ. Calif., Los Angeles.
4. Prior, E. J.: 1970, inDynamics of Satellites 1969, ed. by B. Morando, Springer-Verlag, Berlin, p. 303
5. Geophysical Monograph;E. J. Prior,1972