@article{1250521114,
author = {Hata, Masayoshi},
title = {On the functional equation $\frac{1}{p}\{f(\frac{x}{p})+\cdots+f(\frac{x+p-1}{p})\}=\lambda f(\mu x)$},
journal = {J. Math. Kyoto Univ.},
volume = {25},
number = {4},
year = {1985},
pages = { 357-364},
language = {en},
url = {http://dml.mathdoc.fr/item/1250521114}
}
Hata, Masayoshi. On the functional equation $\frac{1}{p}\{f(\frac{x}{p})+\cdots+f(\frac{x+p-1}{p})\}=\lambda f(\mu x)$. J. Math. Kyoto Univ., Tome 25 (1985) no. 4, pp. 357-364. http://gdmltest.u-ga.fr/item/1250521114/