Saydam Eker, Cigdem. “Potentially Toxic Element Levels in the Eocene Sandstones from Gumushane Area (NE Turkey)”. Journal of Engineering Research and Applied Science 9, no. 1 (July 4, 2020): 1374-1385. Accessed April 18, 2026. https://mail.journaleras.com/index.php/jeras/article/view/196.