@article{JMPA_1877_3_3__415_0,
     author = {Franke, Jean},
     title = {Sur la courbure des surfaces r\'eciproques},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {415--421},
     publisher = {Gauthier-Villars},
     volume = {3e s{\'e}rie, 3},
     year = {1877},
     language = {fr},
     url = {http://www.numdam.org/item/JMPA_1877_3_3__415_0/}
}