TY  - JOUR
AU  - Janusz Matkowski
TI  - Functional inequality characterizing nonnegative concave functions in (0, ?)k.
JO  - Aequationes mathematicae
PY  - 1992
SP  - 219
EP  - 224
VL  - 43
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AM2_1992__43_1_137465/
ID  - AM2_1992__43_1_137465
ER  -