@article{bwmeta1.element.desklight-4b605c48-de60-49d5-8eba-9cd3501d794b,
author = {M. Kuczma},
title = {On squares of differentiable functions},
journal = {Annales Polonici Mathematici},
volume = {21},
year = {1969},
pages = {229-237},
zbl = {0185.29404},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.desklight-4b605c48-de60-49d5-8eba-9cd3501d794b}
}
M. Kuczma. On squares of differentiable functions. Annales Polonici Mathematici, Tome 21 (1969) pp. 229-237. http://gdmltest.u-ga.fr/item/bwmeta1.element.desklight-4b605c48-de60-49d5-8eba-9cd3501d794b/