@article{JMPA_1850_1_15__103_0,
     author = {Liouville, J.},
     title = {Th\'eor\`eme sur l'\'equation $dx^2+dy^2+dz^2=\lambda\left(d\alpha^2+d\beta^2+d\gamma^2\right)$},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {103--103},
     publisher = {Gauthier-Villars},
     volume = {1e s{\'e}rie, 15},
     year = {1850},
     language = {fr},
     url = {http://www.numdam.org/item/JMPA_1850_1_15__103_0/}
}