Proof of Oppenheim's area inequalities for triangles and quadrilaterals.
Carroll, C.E.
Aequationes mathematicae, Tome 25 (1982), p. 97-109 / Harvested from Göttinger Digitalisierungszentrum
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Publié le : 1982-01-01
EUDML-ID : urn:eudml:doc:136929 
@article{GDZPPN002033712,
     title = {Proof of Oppenheim's area inequalities for triangles and quadrilaterals.},
     journal = {Aequationes mathematicae},
     volume = {25},
     year = {1982},
     pages = {97-109},
     zbl = {0511.51020},
     url = {http://dml.mathdoc.fr/item/GDZPPN002033712}
}

Carroll, C.E. Proof of Oppenheim's area inequalities for triangles and quadrilaterals.. Aequationes mathematicae, Tome 25 (1982) pp. 97-109. http://gdmltest.u-ga.fr/item/GDZPPN002033712/