@article{bwmeta1.element.bwnjournal-article-cmv10i1p277bwm,
author = {L. Rubel},
title = {Differentiability of monotonic functions},
journal = {Colloquium Mathematicae},
volume = {10},
year = {1963},
pages = {277-279},
zbl = {0118.05404},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-cmv10i1p277bwm}
}
Rubel, L. Differentiability of monotonic functions. Colloquium Mathematicae, Tome 10 (1963) pp. 277-279. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-cmv10i1p277bwm/