1. Abramowitz, M. and Stegun, I.A.; Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables, National Bureau of Standards, Applied Mathematics Series 55, U.S. Government Printing Office, Washington, D.C., 20402, 1964.
2. Bogoliubov, H. and Mitropolski, J.; Asymptotic Method in the Theory of Nonlinear Oscillations, Hindustan Publishing Corporation, Delhi-6, India, 1961.
3. Brouwer, D.; ‘Solution of the Problem of Artificial Satellite Theory Without Drag’, Astronomical Journal 64, 378–397 (1959).
4. Brouwer, D. and Clemence, G.M.; Method of Celestial Mechanics, Academic Press, New York and London, 1961.
5. Brown, E.W.; An Introductory Treatise on the Lunar Theory, Cambridge University Press, 1986 — reprinted by Dover Publication, Inc., New York, 1960.