@article{MZ_1950__52_169139,
     author = {R. Sauer},
     title = {Parallelogrammgitter als {Modelle} pseudosph\"arischer {Fl\"achen}},
     journal = {Mathematische Zeitschrift},
     pages = {611--622},
     year = {1950},
     volume = {52},
     zbl = {0035.37503},
     url = {http://geodesic.mathdoc.fr/item/MZ_1950__52_169139/}
}