Gräf, Walter, and Anton Ramovš. “Rugose Korallen Aus Dem Jungpaläozoikum Sloweniens (NW Jugoslavien)”. Geologija 8, no. 1 (December 31, 1965): 160–189. Accessed October 26, 2026. https://www.geologija-revija.si/index.php/geologija/article/view/216.