Krobicki, Michał, and Jan Golonka. 2018. “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):3. https://doi.org/10.7494/geotour.2008.13.3.