@article{MOMA_1961__65_177138,
     author = {Walter Wunderlich},
     title = {Fl\"achen mit ebenen {Fallinien.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {291--300},
     publisher = {mathdoc},
     volume = {65},
     year = {1961},
     zbl = {0104.15702},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1961__65_177138/}
}