@article{bwmeta1.element.bwnjournal-article-apmv7i1p21bwm,
author = {Kordylewski, J. and Kuczma, M.},
title = {On the functional equation F(x,$\phi$(x),$\phi$[f(x)])=0},
journal = {Annales Polonici Mathematici},
volume = {7},
year = {1959},
pages = {21-32},
zbl = {0091.11702},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-apmv7i1p21bwm}
}
Kordylewski, J.; Kuczma, M. On the functional equation F(x,φ(x),φ[f(x)])=0. Annales Polonici Mathematici, Tome 7 (1959) pp. 21-32. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-apmv7i1p21bwm/