1. On the excitation of warps in galaxy disks;Bertin;Astron. Astrophys.,1980
2. Apparent thickness of Saturn's rings;Brahic;Nature,1981
3. Methods of Celestial Mechanics;Brouwer,1961
4. Principles of Stellar Dynamics;Chandrasekhar,1942
5. Gravitational resonances in Saturn's rings. II: Perturbations due to Janus, Mimas and Enceladus; The initial profile in Saturn's equatorial plane and warping of the rings;Cook,1976