@article{MZ_1942__48_169012,
     author = {G. N\"obeling},
     title = {\"Uber den {Fl\"acheninhalt} dehnungsbeschr\"ankter {Fl\"achen}},
     journal = {Mathematische Zeitschrift},
     pages = {747--771},
     year = {1942},
     volume = {48},
     zbl = {0028.18803},
     url = {http://geodesic.mathdoc.fr/item/MZ_1942__48_169012/}
}