TY  - JOUR
AU  - J. Steinig
TI  - Some Trigonometric Inequalities.
JO  - Elemente der Mathematik
PY  - 1972
SP  - 121
EP  - 128
VL  - 27
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/ELMA_1972__27_141078/
ID  - ELMA_1972__27_141078
ER  -