Přichystal, Antonín, Jan Michał Burdukiewicz, and Andrzej Wiśniewski. “Silicite („flint”) from Opole-Groszowice: Contribution to Recognition of the Raw Materials Used During Prehistory in the Odra River Valley”. Sprawozdania Archeologiczne 74, no. 1 (December 21, 2022): 31–48. Accessed September 30, 2023. https://journals.iaepan.pl/sa/article/view/3009.