@article{MZ_1970__115_171343,
     author = {Stefan Hildebrandt},
     title = {Einige {Bemerkungen} \"uber {Fl\"achen} beschr\"ankter mittlerer {Kr\"ummung.}},
     journal = {Mathematische Zeitschrift},
     pages = {169--178},
     publisher = {mathdoc},
     volume = {115},
     year = {1970},
     zbl = {0185.50201},
     url = {http://geodesic.mathdoc.fr/item/MZ_1970__115_171343/}
}