@book{Borowiecki:2021,
author
=
"P.Borowiecki and -.[et al.]",
title
=
"Discussiones Mathematicae - Graph Theory, ISSN: 1234-3099",
publisher
=
"University of Zielona Góra Press",
address
=
"Zielona Góra",
year
=
"2021",
volume
=
"Vol. 41(no. 1-4) ",
number
=
"no. 1-4",
}