@article{MZ_1928__28_168037,
     author = {Th., Estermann},
     title = {\"Uber den {Vektorenbereich} eines konvexen {K\"orpers}},
     journal = {Mathematische Zeitschrift},
     pages = {471--475},
     publisher = {mathdoc},
     volume = {28},
     year = {1928},
     zbl = {54.0798.03},
     url = {http://geodesic.mathdoc.fr/item/MZ_1928__28_168037/}
}