@article{GDZPPN002064421,
title = {Double collisions for a classical particle system with nongravitational interactions.},
journal = {Commentarii mathematici Helvetici},
volume = {56},
year = {1981},
pages = {524-557},
zbl = {0498.70015},
url = {http://dml.mathdoc.fr/item/GDZPPN002064421}
}
McGehee, Richard. Double collisions for a classical particle system with nongravitational interactions.. Commentarii mathematici Helvetici, Tome 56 (1981) pp. 524-557. http://gdmltest.u-ga.fr/item/GDZPPN002064421/