@article{MAN_1930__103_159418,
     author = {B. Kaufmann},
     title = {\"Uber die {Berandung} ebener und r\"aumlicher {Gebiete} {(Primendentheorie)}},
     journal = {Mathematische Annalen},
     pages = {70--144},
     publisher = {mathdoc},
     volume = {103},
     year = {1930},
     zbl = {56.0848.01},
     url = {http://geodesic.mathdoc.fr/item/MAN_1930__103_159418/}
}