Kupka, Jiří, Hana Švehláková, and Rostislav Poláček. “Selected Environmental Issues of the Landscape of Shale (Nízký Jeseník Mt., Czechia) – Preliminary Results”. Annales Universitatis Paedagogicae Cracoviensis Studia Naturae 4, no. 1 (December 31, 2019): 135–145. Accessed April 24, 2024. https://aupcstudianaturae.uken.krakow.pl/article/view/5529.