@article{MAN_1957__133_160553,
     author = {H. Werner},
     title = {Das {Problem} von {Douglas} f\"ur {Fl\"achen} konstanter mittlerer {Kr\"ummung.}},
     journal = {Mathematische Annalen},
     pages = {303--319},
     publisher = {mathdoc},
     volume = {133},
     year = {1957},
     zbl = {0077.34901},
     url = {http://geodesic.mathdoc.fr/item/MAN_1957__133_160553/}
}