@article{bwmeta1.element.desklight-82240788-197f-4ff2-8775-84196e8bd994,
author = {N. K. Kundu and S. N. Mukhopadhyay},
title = {Symmetric derivative of nowhere monotone functions, I},
journal = {Annales Polonici Mathematici},
volume = {23},
year = {1970},
pages = {247-253},
zbl = {0204.08102},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.desklight-82240788-197f-4ff2-8775-84196e8bd994}
}
N. K. Kundu; S. N. Mukhopadhyay. Symmetric derivative of nowhere monotone functions, I. Annales Polonici Mathematici, Tome 23 (1970) pp. 247-253. http://gdmltest.u-ga.fr/item/bwmeta1.element.desklight-82240788-197f-4ff2-8775-84196e8bd994/