1. Adamovič J, Mikuláš R, Schweistillová J, Böhmová V (2011) Porosity changes induced by salt weathering of sandstone, Bohemian Cretaceoust Basin, Czech Rep. Acta Geodyn Geomater 8(1):29–45
2. Air pollution in Poland 1996-1997, 1998-1999 (1998, 2001) Biblioteka Monitoringu Środowiska, Warszawa (in Polish)
3. Air Quality Monitoring System (2016) http://monitoring.krakow.pios.gov.pl/ archiwalne-dane-pomiarowe/automatyczne/stacja/159/parametry/1787/miesięczny. Accessed 20 June 2018 (in Polish)
4. Alexandrowicz Z (1970) Sandstone rocks in the vicinity of Ciężkowice on the Biała River. Ochrona Przyrody 35:281–335 (in Polish, with English abstract)
5. Alexandrowicz Z (1977) The origin of sandstone tors in the Polish Western Carpathians. Bull Pol Acad Sci Earth Ser 25(2):83–90