Grad, Karel, Stevo Dozet, Rajko Petrica, and Lija Rijavec. 1996. “Pseudosocka Beds With Coal in Borehole Tdp-1/84 Trobni Dol (Eastern Sava Folds, Slovenia)”. Geologija 39 (1):97-118. https://doi.org/10.5474/geologija.1996.004.