@InCollection{Borowiecki:1989,
author
=
"M.Borowiecki and D.Michalak",
title
=
"On hallian digraphs and their binding number",
pages
=
"33--37",
year
=
"1989",
booktitle
=
"Combinatorics and graph theory ISBN: 8301093005",
publisher
=
"Polish Scientific Publishers",
address
=
"Warszawa",
series
=
"Banach Center Publications, Vol. 25",
}