@article{Kisielewicz:2009,
author
=
"M.Kisielewicz and L.Rybiński",
title
=
"Generalized fixed point theorem",
journal
=
"Demonstratio Mathematica",
volume
=
"Vol. 16",
number
=
"no 4",
pages
=
"1037--1041",
year
=
"1983",
}