TY  - JOUR
AU  - V. I. Averbukh
TI  - Duality between differentiability and rotundity for convex functions
JO  - Matematičeskie zametki
PY  - 1974
SP  - 809
EP  - 820
VL  - 15
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZM_1974_15_5_a17/
LA  - ru
ID  - MZM_1974_15_5_a17
ER  -