@article{MOMA_1951__55_176877,
     author = {Erwin Kruppa},
     title = {Nat\"urliche {Geometrie} der {Mindingschen} {Verbiegungen} der {Strahlfl\"achen.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {340--345},
     publisher = {mathdoc},
     volume = {55},
     year = {1951},
     zbl = {0043.36705},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1951__55_176877/}
}