@article{ELMA_1983__38_141310,
     author = {W. Kuperberg},
     title = {On minimum area quadrilaterals and triangles circumscribed about convex plane regions.},
     journal = {Elemente der Mathematik},
     pages = {57--61},
     publisher = {mathdoc},
     volume = {38},
     year = {1983},
     zbl = {0514.52007},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1983__38_141310/}
}