Papanicolaou, C., J. Typou, J. Ioakeim, T. Kotis, and A. Foscolos. “The Prospect of Using Greek Lignite in an Energy Portfolio Related to Power Generation”. Bulletin of the Geological Society of Greece, vol. 47, no. 4, Jan. 2013, pp. 2121-30, doi:10.12681/bgsg.11107.