Oikonomopoulos, I., Perraki, T., Kaouras, G., & Antoniadis, P. (2007). MINERALOGICAL STUDY OF INORGANIC INTERCALATED SEAMS AT ACHLADA LIGNITE DEPOSITS (NW GREECE). Bulletin of the Geological Society of Greece, 40(2), 906–917. https://doi.org/10.12681/bgsg.16744