Zupančič, Nina, Stanka Šebela, in Miloš Miler. „Mineralogical and Chemical Characteristics of Black Coatings in Postojna Cave System“. Acta Carsologica 40, no. 2 (september 1, 2011). Pridobljeno julij 18, 2024. https://ojs.zrc-sazu.si/carsologica/article/view/15.