WÓJCIK, Marek L. An Appendix to the Newest Research on the Last Will of Mieszko II the Obese, the Duke of Opole and Racibórz. Wieki Stare i Nowe, [S. l.], v. 4, p. 57–73, 2005. DOI: 10.31261/WSN.2005.05.04. Disponível em: https://journals.us.edu.pl/index.php/WSN/article/view/18660. Acesso em: 15 nov. 2026.