@article{CMH_1938__11_138731,
     author = {Siegfried Gr\"unbaum},
     title = {\"Uber die {Bestimmung} von {Fl\"achen} aus ihrer {Normalkr\"ummung} l\"angs einer {Schar} geod\"atischer {Linien.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {336--361},
     publisher = {mathdoc},
     volume = {11},
     year = {1938},
     zbl = {0021.15502},
     url = {http://geodesic.mathdoc.fr/item/CMH_1938__11_138731/}
}