@InCollection{Lubik:2022,
author
=
"M.Lubik",
title
=
"Cross-border Cooperation Between Óláfr Haraldsson and the Clan of Rognvaldr Úlfsson",
pages
=
"166--178",
year
=
"2022",
booktitle
=
"Continuation or Change? Borders and Frontiers in Late Antiquity amd Medieval EuropeLandscape of Power Network, Military Organisation, and Commerce ISBN: 9781032212838",
editor
=
"ed. by Gregory Leighton, Łukasz Różycki, Piotr Pranke",
publisher
=
"Routledge - Taylor & Francis Group",
address
=
"London and New York",
}