ΚΑΛΑΪΤΖΙΔΗΣ Σ., ΠΑΠΑΖΗΣΙΜΟΥ Σ. and ΧΡΗΣΤΑΝΗΣ Κ. (2001) “Forming conditions of the Graikas lignite, N. Peloponnese”, Bulletin of the Geological Society of Greece, 34(3), pp. 1195–1204. doi: 10.12681/bgsg.17183.