Mikuž, Vasja. “The Serpulid Worm Rotularia Spirulaea from Eocene Beds Near Gračišće in Istria, Croatia”. Geologija 51, no. 2 (December 31, 2008): 161–168. Accessed August 6, 2025. https://www.geologija-revija.si/index.php/geologija/article/view/1157.