TY  - JOUR
AU  - Lawrence Zalcman
TI  - Positive derivatives and increasing functions.
JO  - Elemente der Mathematik
PY  - 1988
SP  - 120
EP  - 121
VL  - 43
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/ELMA_1988__43_3_141435/
ID  - ELMA_1988__43_3_141435
ER  -