@article{MZ_1966__93_170578,
     author = {Woldemar Barthel and Gudrun Bauer},
     title = {Die {Fundamentals\"atze} der {Fl\"achentheorie} in einem affinen {Raum} mit {Areal.}},
     journal = {Mathematische Zeitschrift},
     pages = {87--104},
     publisher = {mathdoc},
     volume = {93},
     year = {1966},
     zbl = {0141.18901},
     url = {http://geodesic.mathdoc.fr/item/MZ_1966__93_170578/}
}