Karageorgiou, D. E., Metaxas, A., Dimitriou, D., Arapogiannis, E. and Varvarousis, G. (2010) “CONTRIBUTION OF LIGNITE IN THE GREEK ECONOMY”, Bulletin of the Geological Society of Greece, 43(5), pp. 2229–2235. doi: 10.12681/bgsg.11422.