@article{ELMA_1961__16_140729,
     author = {H. Dirnb\"ock},
     title = {Eine einfache {L\"osung} des {Normalenproblems} der {Fl\"ache} zweiter {Ordnung.}},
     journal = {Elemente der Mathematik},
     pages = {82--86},
     publisher = {mathdoc},
     volume = {16},
     year = {1961},
     zbl = {0098.36801},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1961__16_140729/}
}