@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/}
}