(1)
Kozur, H. W.; Ramovš, A.; Wang, C.- yuan; Zakharov, Y. D. 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 1994, 37 (1), 173-213. https://doi.org/10.5474/geologija.1995.007.