Dolenec, Tadej, Sonja Lojen, and Matej Dolenec. 1999. “The Permian-Triassic Boundary in the Idrijca Valley (Western Slovenia) : Isotopic Fractionation Between Carbonate and Organic Carbon at the P Tr Transition ”. Geologija 42 (1): 165-70. https://doi.org/10.5474/geologija.1999.011.