@article{MZ_1951__55_169260,
     author = {D. Ohmann},
     title = {Extremalprobleme f\"ur konvexe {Bereiche} der euklidischen {Ebene.}},
     journal = {Mathematische Zeitschrift},
     pages = {346--352},
     publisher = {mathdoc},
     volume = {55},
     year = {1951},
     zbl = {0046.15904},
     url = {http://geodesic.mathdoc.fr/item/MZ_1951__55_169260/}
}