Pantelaki, O., G. Bellis, and E. Stamboliadis. “The Upgrading Amenability of the Phosphate Deposits of Western Greece”. Bulletin of the Geological Society of Greece 47, no. 4 (January 21, 2013): 2000–2009. Accessed May 7, 2024. https://ejournals.epublishing.ekt.gr/index.php/geosociety/article/view/11025.