Krobicki, Michał, and Jan Golonka. “Geological History of the Pieniny Klippen Belt and Middle Jurassic Black Shales As One of the Oldest Deposits of This Region – Stratigraphical Position and Palaeoenvironmental Significance”. Geotourism/Geoturystyka, no. 13 (July 4, 2018): 3. Accessed May 6, 2024. https://journals.agh.edu.pl/geotour/article/view/686.