KITTEL, Piotr, SIKORA, Jerzy and WRONIECKI, Piotr. The morphology of the Luciąża River valley floor in the vicinity of the Rozprza medieval ring-fort in light of geophysical survey. Bulletin of Geography. Physical Geography Series. Online. 25 July 2015. No. 8, pp. 95-106. [Accessed 18 July 2024]. DOI 10.2478/7033.