@article{Matkowski:2009,
author
=
"J.Matkowski",
title
=
"The uniqueness of solutions of a system of functional equations in some classes of functions",
journal
=
"Aequationes Mathematicae",
volume
=
"Vol. 8",
number
=
"no 3",
pages
=
"233--237",
year
=
"1972",
}