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, [S. l.], v. 38, n. 2, p. 131–139, 2024. Disponível em: https://js.ugd.edu.mk/index.php/GEOLMAC/article/view/6992. Acesso em: 5 may. 2026.