TY  - JOUR
AU  - C.E. Carroll
TI  - Proof of Oppenheim's area inequalities for triangles and quadrilaterals.
JO  - Aequationes mathematicae
PY  - 1982
SP  - 97
EP  - 109
VL  - 24
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AM2_1982__24_136929/
ID  - AM2_1982__24_136929
ER  -