Dozet, S.; Kanduč, T.; Markič, M. A Contribution to Petrology of Dark Grey to Black Interbeds Within Upper Permian and Triassic Carbonate Rocks in the Area Between Ljubljana and Bloke, Central Slovenia. geologija 2012, 55 (1), 77-91. https://doi.org/10.5474/geologija.2012.006.