@article{Borowiecki:2009,
author
=
"M.Borowiecki and I.Broere and P.Mihok",
title
=
"Minimal reducible bounds for planar graphs",
journal
=
"Discrete Mathematics",
volume
=
"Vol. 212",
number
=
"no 1-2",
pages
=
"19--27",
year
=
"2000",
}