@article{00753961,
title = {Differentiability of convex functions on a Banach space with smooth bump function.},
journal = {Journal of Convex Analysis},
volume = {1},
year = {1994},
pages = {47-60},
zbl = {0823.46042},
language = {en},
url = {http://dml.mathdoc.fr/item/00753961}
}
Li, Yongxin; Shi, Shuzhong. Differentiability of convex functions on a Banach space with smooth bump function.. Journal of Convex Analysis, Tome 1 (1994) pp. 47-60. http://gdmltest.u-ga.fr/item/00753961/