J. Llibre et Dg. Saari, PERIODIC-ORBITS FOR THE PLANAR NEWTONIAN 3-BODY PROBLEM COMING FROM THE ELLIPTIC RESTRICTED 3-BODY PROBLEMS, Transactions of the American Mathematical Society, 347(8), 1995, pp. 3017-3030
Through the introduction of a new coordinate system followed by a Poin
care compactification, a new relationship is developed to connect the
planar three-body problem with the various planar restricted three-bod
y systems. This framework is further used to develop new conditions fo
r the continuation of symmetric periodic orbits from elliptic restrict
ed systems to the full planar three-body problem.