@article{Lichawski:2009,
author
=
"K.Lichawski and J.Matkowski and J.Miś",
title
=
"Locally defined operators in the space of differentiable functions",
journal
=
"Bulletin of the Polish Academy of Sciences. Mathematics",
volume
=
"Vol. 37",
number
=
"no 1-6",
pages
=
"315--325",
year
=
"1989",
}