@article{JMPA_1874_2_19__57_0,
     author = {Painvin, L.},
     title = {\'Etude d'un syst\`eme de rayons},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {57--112},
     publisher = {Gauthier-Villars},
     volume = {2e s{\'e}rie, 19},
     year = {1874},
     language = {fr},
     url = {http://www.numdam.org/item/JMPA_1874_2_19__57_0/}
}