@article{JMPA_1862_2_7__121_0,
     author = {Mannheim},
     title = {Sur les arcs des courbes planes ou sph\'eriques consid\'er\'ees comme enveloppes de cercles},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {121--135},
     publisher = {Gauthier-Villars},
     volume = {2e s{\'e}rie, 7},
     year = {1862},
     language = {fr},
     url = {http://www.numdam.org/item/JMPA_1862_2_7__121_0/}
}