@article{GDZPPN002080745,
title = {On minimum area quadrilaterals and triangles circumscribed about convex plane regions.},
journal = {Elemente der Mathematik},
volume = {38},
year = {1983},
pages = {57-61},
zbl = {0514.52007},
url = {http://dml.mathdoc.fr/item/GDZPPN002080745}
}
Kuperberg, W. On minimum area quadrilaterals and triangles circumscribed about convex plane regions.. Elemente der Mathematik, Tome 38 (1983) pp. 57-61. http://gdmltest.u-ga.fr/item/GDZPPN002080745/