ΣΑΧΑΝΙΔΗΣ Χ., ΓΕΩΡΓΑΚΟΠΟΥΛΟΣ Α., ΦΙΛΙΠΠΙΔΗΣ Α., and ΚΑΣΩΛΗ-ΦΟΥΡΝΑΡΑΚΗ Α. “Trace Element Contents in Marls of the Ptolemais - Amynteon Lignite Basin, Western Macedonia, Greece”. Bulletin of the Geological Society of Greece, vol. 34, no. 3, Jan. 2001, pp. 1115-22, doi:10.12681/bgsg.17171.