@article{MOMA_1984__97_178159,
     author = {P. Gritzmann and U. Betke},
     title = {Polyedrische {2-Mannigfaltigkeiten} mit wenigen nicht-konvexen {Ecken.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {1--22},
     publisher = {mathdoc},
     volume = {97},
     year = {1984},
     zbl = {0525.52009},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1984__97_178159/}
}