Voudouris, P., I. Psimis, C. Mavrogonatos, C. Kanellopoulos, M. Kati, and E. Chlekou. “Amethyst Occurrences in Tertiary Volcanic Rocks of Greece: Mineralogical and Genetic Implications”. Bulletin of the Geological Society of Greece, vol. 47, no. 1, Dec. 2013, pp. 477-86, doi:10.12681/bgsg.11026.