@article{CMH_1955__29_139102,
     author = {W. Scherrer},
     title = {Die {Grundgleichungen} der {Fl\"achentheorie.} {I.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {180--198},
     year = {1955},
     volume = {29},
     zbl = {0064.15703},
     url = {http://geodesic.mathdoc.fr/item/CMH_1955__29_139102/}
}