“VOLCANIC ACTIVITY IN THE KOŽUF MOUNTAIN AREA AND IMPLICATIONS FOR THE DISTRIBUTION OF RARE EARTH ELEMENTS IN DIATOMITE AND TRIDYMITE”. Geologica Macedonica 33, no. 1 (June 17, 2019): 5–24. Accessed November 4, 2025. https://js.ugd.edu.mk/index.php/GEOLMAC/article/view/3025.