@article{JMPA_1848_1_13__209_0,
     author = {Roberts, William},
     title = {Extrait d'une lettre adress\'ee \`a {M.} {Liouville}},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {209--220},
     year = {1848},
     publisher = {Gauthier-Villars},
     volume = {1e s{\'e}rie, 13},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/item/JMPA_1848_1_13__209_0/}
}