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@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/} }
W. Kuperberg. On minimum area quadrilaterals and triangles circumscribed about convex plane regions.. Elemente der Mathematik, Tome 38 (1983), pp. 57-61. http://geodesic.mathdoc.fr/item/ELMA_1983__38_141310/