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@article{AM2_1982__24_136929, author = {C.E. Carroll}, title = {Proof of {Oppenheim's} area inequalities for triangles and quadrilaterals.}, journal = {Aequationes mathematicae}, pages = {97--109}, publisher = {mathdoc}, volume = {24}, year = {1982}, zbl = {0511.51020}, url = {http://geodesic.mathdoc.fr/item/AM2_1982__24_136929/} }
C.E. Carroll. Proof of Oppenheim's area inequalities for triangles and quadrilaterals.. Aequationes mathematicae, Tome 24 (1982), pp. 97-109. http://geodesic.mathdoc.fr/item/AM2_1982__24_136929/