Biniaś-Szkopek, Magdalena. “Who Was Silesia For? Conflicts Within the Piast Dynasty over the Rule in Silesia in the Second Half of the 12th Century”. The Opole Studies in Administration and Law 14, no. 4 (2) (December 15, 2016): 25–36. Accessed December 5, 2024. https://czasopisma.uni.opole.pl/index.php/osap/article/view/1309.