1. Abramowitz, M., Stegun, I.A. (eds.): Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables, chap. 9, 10. U.S. Department of Commerce and Knovel Library (online), 10th ed. (1972)
2. Allen, A.J., Palmer, P.L., Papaloizou, J.: A conservative numerical technique for collisionless dynamical systems: comparision of the radial and circular orbit instabilities. Mon. Not. R. Astron. Soc. 242, 576–594 (1992)
3. Arfken, G.: Mathematical Methods for Physicists, chap. 9, 11, 12, 3rd edn. Academic Press Inc, NY (1985)
4. Brillouin, M.: Equations aux Dériveées partielles du 2e ordre. Domaines à connexion multiple. Fonctions sphériques non antipodes. Annales De L’Institut H. Poincaré 4(2), 173–206 (1933)
5. Cangahuala, L.A.: Augmentations to the Polyhedral Gravity Model to Facilitate Small Body Navigation. American Astronomical Society, Washington DC (2005)