TY  - JOUR
AU  - Austin, D.G.
TI  - A Lipschitzian characterization of approximately differentiable functions
JO  - Portugaliae mathematica
PY  - 1956
SP  - 19
EP  - 29
VL  - 15
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/PORMA_1956__15_1_114764/
LA  - en
ID  - PORMA_1956__15_1_114764
ER  -