1. The two-body problem under the inverse square central force and equivalent geodesic flows;Belbruno;Celestial Mech.,1977
2. The restricted problem of three bodies;Birkhoff,1950
3. Singularities in classical mechanical systems;Devaney,1981
4. Regularization of vector fields by surgery;Easton;J. Differential Equations,1971
5. Perturbation theory of Kepler motion based on spinor regularization;Kustaanheimo;J. Reine Angew. Math.,1965