Kittel, P., Sikora, J. and Wroniecki, P. 2015. 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. 8 (Jul. 2015), 95–106. DOI:https://doi.org/10.2478/7033.