@article{JMPA_1903_5_9__21_0,
     author = {Beghin and Rousseau},
     title = {Sur les percussions dans les syst\`emes non holonomes},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {21--26},
     publisher = {Gauthier-Villars},
     volume = {5e s{\'e}rie, 9},
     year = {1903},
     language = {fr},
     url = {http://www.numdam.org/item/JMPA_1903_5_9__21_0/}
}