@article{ELMA_1978__33_141217,
     author = {Heiko Harborth},
     title = {Konvexe {F\"unfecke} in ebenen {Punktmengen.}},
     journal = {Elemente der Mathematik},
     pages = {116--118},
     publisher = {mathdoc},
     volume = {33},
     year = {1978},
     zbl = {0397.52005},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1978__33_141217/}
}