@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}, publisher = {Gauthier-Villars}, volume = {1e s{\'e}rie, 13}, year = {1848}, language = {fr}, url = {http://archive.numdam.org/item/JMPA_1848_1_13__209_0/} }