@article{JMPA_1940_9_19_1-4_211_0,
     author = {Cotton, \'Emile},
     title = {Sur le calcul des invariants diff\'erentiels euclidiens d'une surface},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {211--220},
     publisher = {Gauthier-Villars},
     volume = {9e s{\'e}rie, 19},
     number = {1-4},
     year = {1940},
     zbl = {0024.27803},
     language = {fr},
     url = {http://archive.numdam.org/item/JMPA_1940_9_19_1-4_211_0/}
}