Gičevski, B., V. Mirčovski, S. Hristovski, and M. Petrič. “NATURAL TRACERS AS A TOOL FOR UNDERSTANDING THE FUNCTIONING OF THE KARST SYSTEM AND ITS VULNERABILITY - A CASE STUDY OF THE MANASTIREC SPRING”. Geologica Macedonica, Vol. 38, no. 2, Nov. 2024, pp. 131-9, https://js.ugd.edu.mk/index.php/GEOLMAC/article/view/6992.