@article{Borowiecki:2009,
author
=
"P.Borowiecki and M.Kubale",
title
=
"A survey of hard-to-color graphs for off-line and on-line model of vertex coloring",
journal
=
"Journal of Applied Computer Science",
volume
=
"Vol. 9",
number
=
"no 2",
pages
=
"7--17",
year
=
"2001",
}