Kozur, Heinz W., Anton Ramovš, Cheng-yuan Wang, and Yurij D. Zakharov. “The Importance of Hindeodus Parvus (Conodonta) for the Definition of the Permian-Triassic Boundary and Evaluation of the Proposed Sections for a Global Stratotype Section and Point (GSSP) for the Base of the Triassic”. Geologija 37, no. 1 (December 31, 1994): 173–213. Accessed October 7, 2022. https://www.geologija-revija.si/index.php/geologija/article/view/836.