Mackiewicz M, Myślecki B. Non-invasive research on medieval strongholds in Silesia. Case studies from Borucin (Silesian province) and Chrzelice (Opole province). apolona [Internet]. 2015 Jan. 1 [cited 2024 May 2];53:305-11. Available from: https://journals.iaepan.pl/apolona/article/view/336