@article{JMPA_1853_1_18__71_0,
     author = {Liouville, J.},
     title = {Sur l'\'equation aux diff\'erences partielles $\frac{d^2\log \lambda}{du d\nu}\pm\frac{\lambda}{2a^2}= \mathrm{o}$},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {71--72},
     publisher = {Gauthier-Villars},
     volume = {1e s{\'e}rie, 18},
     year = {1853},
     language = {fr},
     url = {http://archive.numdam.org/item/JMPA_1853_1_18__71_0/}
}