1. For the classical treatment of secular perturbations, see D. Brouwer and G.M. Clemence, Methods of Celestial Mechanics, Academic Press, New York (1961) (especially Ch. XVI).
2. Other treatments of this problem are given by A.E. Roy, Orbital Motion, Hilger, Bristol (1978)
3. J.G. Williams, Secular Perturbations in the Solar System, Ph. D. Dissertation, Univ. of California, (1969) (with a particular emphasis on the case of asteroids). As regards long-term numerical integration of planetary orbits
4. see A.E. Roy et al., Project LONGSTOP, Vistas in Astronomy, 32 (1988). On orbital resonances, see S.J. Peale, Orbital Resonances in the Solar System, Annual Reviews of Astronomy and Astrophysics (1976), and R. Greenberg, Orbit-orbit Resonances in the Solar System: Varieties and Similarities, Vistas in Astronomy, 21, (1977).
5. On tidal evolution, see K. Lambeck, The Earth’s Variable Rotation, Cambridge Univ. Press, Cambridge (1980), Ch. 10