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@article{MOMA_1954__57_176921, author = {Robert Sauer}, title = {Differenzengeometrie der infinitesimalen {Fl\"achenverbiegung.}}, journal = {Monatshefte f\"ur Mathematik}, pages = {177--184}, publisher = {mathdoc}, volume = {57}, year = {1954}, zbl = {0052.17301}, url = {http://geodesic.mathdoc.fr/item/MOMA_1954__57_176921/} }
Robert Sauer. Differenzengeometrie der infinitesimalen Flächenverbiegung.. Monatshefte für Mathematik, Tome 57 (1954), pp. 177-184. http://geodesic.mathdoc.fr/item/MOMA_1954__57_176921/