@article{MOMA_1983__96_178135,
     author = {H. Groemer},
     title = {Extremal {Convex} {Sets.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {29--40},
     publisher = {mathdoc},
     volume = {96},
     year = {1983},
     zbl = {0513.52003},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1983__96_178135/}
}