Kubiak-Wójcicka, K., Brózda, S. and Sznajder, A. 2017. Hydrographic changes in a river system and their influence on the legal classification of watercourses, exemplified by selected tributaries of the San river. Bulletin of Geography. Physical Geography Series. 12 (Jan. 2017), 5–17. DOI:https://doi.org/10.1515/bgeo-2017-0001.