@article{Borowiecki:2009,
author
=
"M.Borowiecki and E.Łazuka",
title
=
"On chromaticity of hypergraphs",
journal
=
"Discrete Mathematics",
volume
=
"Vol. 307",
number
=
"no 11-12",
pages
=
"1418--1429",
year
=
"2007",
}