Mackiewicz, Maksym, and Bartosz Myślecki. “Non-Invasive Research on Medieval Strongholds in Silesia. Case Studies from Borucin (Silesian Province) and Chrzelice (Opole Province)”. Archaeologia Polona 53 (January 1, 2015): 305–311. Accessed July 3, 2024. https://journals.iaepan.pl/apolona/article/view/336.