TY  - JOUR
AU  - L. Rubel
TI  - Differentiability of monotonic functions
JO  - Colloquium Mathematicum
PY  - 1963
SP  - 277
EP  - 279
VL  - 10
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/cm-10-2-277-279/
DO  - 10.4064/cm-10-2-277-279
LA  - en
ID  - 10_4064_cm_10_2_277_279
ER  -