@inbook{52d5be2b05cd4b29bef37a0540ef0884,
title = "Dating Hammershus Castle - crusader or archbishops castle?",
author = "Vivian Etting and Nils Engberg",
year = "2018",
language = "English",
isbn = "9783774940987",
series = "Castella Maris Baltici",
pages = "29--40",
editor = "Niels Engberg and Vivian Etting and {Sass Jensen}, {Lars Meldgaard } and Claus S{\o}rensen and Dorthe Wille-J{\o}rgensen",
booktitle = "Building a castle",
publisher = "Dr. Rudolf Habelt GmbH",
address = "Germany",
note = "Castella Maris Baltici ; Conference date: 24-08-2015 Through 28-08-2015",
}