TY  - JOUR
AU  - John de Groot
TI  - A System of Continuous, Mutually Non-differentiable Functions.
JO  - Mathematische Zeitschrift
PY  - 1956
SP  - 192
EP  - 194
VL  - 64
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZ_1956__64_169566/
ID  - MZ_1956__64_169566
ER  -