@article{bwmeta1.element.bwnjournal-article-apmv6i3p281bwm,
author = {Kuczma, M.},
title = {On the functional equation $\phi$(x)+$\phi$[f(x)]=F(x)},
journal = {Annales Polonici Mathematici},
volume = {7},
year = {1959},
pages = {281-287},
zbl = {0091.11701},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-apmv6i3p281bwm}
}
Kuczma, M. On the functional equation φ(x)+φ[f(x)]=F(x). Annales Polonici Mathematici, Tome 7 (1959) pp. 281-287. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-apmv6i3p281bwm/