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