Dolenec, Tadej, and Sonja Lojen. 2000. “Ce Anomaly at the Permian-Triassic Boundary in the Idrijca Valley As Evidence of Changing Redox Conditions at the P Tr Transition in the Western Tethys (Slovenia) ”. Geologija 43 (1): 103-7. https://doi.org/10.5474/geologija.2000.009.