Kempe, Stephan, Hans-Peter Hubrich, and Klaus Suckstorff. “The Story of the 1833 Fercher Survey, Postojnska Jama, Continues: An Additional Document and Newly Discovered Inscriptions”. Acta Carsologica 35, no. 1 (June 1, 2006). Accessed May 4, 2024. https://ojs.zrc-sazu.si/carsologica/article/view/249.