Krobicki, M.; Golonka, J. 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. geotour 2018, No. 13, 3. https://doi.org/10.7494/geotour.2008.13.3.