Koukis, G., N. Sabatakakis, and S. Papanakli. “Laboratory Testing Properties of Sandstones”. Bulletin of the Geological Society of Greece 40, no. 4 (January 1, 2007): 1695–1702. Accessed July 17, 2024. https://ejournals.epublishing.ekt.gr/index.php/geosociety/article/view/17083.