Boev, Blazo, and Zlatko Ilijovski. 2013. “Mineralogical- Geochemical Characteristic of the Neogene Sediments at the Coal Mine of Zivojno in the Pelagonia Depression”. Geologica Macedonica 27 (1), pp. 55-63. https://js.ugd.edu.mk/index.php/GEOLMAC/article/view/741.