@article{Borowiecki:2012,
author
=
"M.Borowiecki and E.Drgas-Burchardt",
title
=
"Acyclic homomorphisms to stars of graph Cartesian products and chordal bipartite graphs",
journal
=
"Discrete Mathematics",
volume
=
"Vol. 312",
number
=
"no 14",
pages
=
"2146--2152",
year
=
"2012",
}