@article{JMPA_1855_1_20__145_0,
     author = {De La Gournerie},
     title = {\'Etude sur la courbure des surfaces},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {145--156},
     publisher = {Gauthier-Villars},
     volume = {1e s{\'e}rie, 20},
     year = {1855},
     language = {fr},
     url = {http://www.numdam.org/item/JMPA_1855_1_20__145_0/}
}