@article{Matkowski:2009,
author
=
"J.Matkowski",
title
=
"On the continuous dependences of $C^{r}$ solutions of a functional equation on the given functions",
journal
=
"Aequationes Mathematicae",
volume
=
"Vol. 6",
pages
=
"215--227",
year
=
"1971",
}