Siavalas G, Tsompanidou E, Kalaitzidis S, Bouzinos A, Christanis Κ. EARLY STAGES OF LIGNITE FORMATION IN PTOLEMAIS BASIN: A COAL-PETROGRAPHIC APPROACH. geosociety [Internet]. 2004 Jan. 1 [cited 2024 Aug. 16];36(1):334-41. Available from: https://ejournals.epublishing.ekt.gr/index.php/geosociety/article/view/16678