FREZA‑OLCZYK, Mariola. Stepmother and stepson: Duchess Matilda in the power struggle after the death of her husband Barnim I, the Duke of Pomerania. Studia z Dziejów Średniowiecza, [S. l.], n. 23, p. 83–99, 2019. DOI: 10.26881/sds.2019.23.03. Disponível em: https://czasopisma.bg.ug.edu.pl/index.php/stzdsr/article/view/4134. Acesso em: 19 kwi. 2024.