References
Poincaré, H. "Sur les équations de la dynamique et le problème de trois corps." Acta Math. 13, 1-270, 1890.
Poincaré, H. Nouv. Méth. de la Méc. Cél. 1, 233, 1892.
Whittaker, E. T. "Poincaré's Theorem." §165 in A Treatise on the Analytical Dynamics of Particles and Rigid Bodies: With an Introduction to the Problem of Three Bodies. New York: Dover, pp. 380-385, 1944.
