@article{GDZPPN002094096, title = {Collision Orbits in the Anisotropic Kepler Problem.}, journal = {Inventiones mathematicae}, volume = {46}, year = {1978}, pages = {221-252}, zbl = {0382.58015}, url = {http://dml.mathdoc.fr/item/GDZPPN002094096} }
Devaney, Robert L. Collision Orbits in the Anisotropic Kepler Problem.. Inventiones mathematicae, Tome 46 (1978) pp. 221-252. http://gdmltest.u-ga.fr/item/GDZPPN002094096/