@article{MAN_1939__116_159995,
     author = {W. Damk\"ohler},
     title = {Funktionen geringster {Steilheit}},
     journal = {Mathematische Annalen},
     pages = {104--165},
     publisher = {mathdoc},
     volume = {116},
     year = {1939},
     zbl = {0019.35201},
     url = {http://geodesic.mathdoc.fr/item/MAN_1939__116_159995/}
}