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@article{CMH_1981__56_139883, author = {Richard McGehee}, title = {Double collisions for a classical particle system with nongravitational interactions.}, journal = {Commentarii mathematici Helvetici}, pages = {524--557}, publisher = {mathdoc}, volume = {56}, year = {1981}, zbl = {0498.70015}, url = {http://geodesic.mathdoc.fr/item/CMH_1981__56_139883/} }
Richard McGehee. Double collisions for a classical particle system with nongravitational interactions.. Commentarii mathematici Helvetici, Tome 56 (1981), pp. 524-557. http://geodesic.mathdoc.fr/item/CMH_1981__56_139883/