@article{JMPA_1847_1_12__41_0,
     author = {Roberts, William},
     title = {G\'en\'eralisation d'une propri\'et\'e de la lemniscate},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {41--49},
     publisher = {Gauthier-Villars},
     volume = {1e s{\'e}rie, 12},
     year = {1847},
     language = {fr},
     url = {http://www.numdam.org/item/JMPA_1847_1_12__41_0/}
}