Balabanova, Biljana, Trajče Stafilov, Robert Šajn, and Claudiu Tănăselia. 2015. “Lead Distribution in Soil Due to Lithogenic and Anthropogenic Factors in the Bregalnica River Basin”. Geologica Macedonica 29 (1), pp. 53-62. https://js.ugd.edu.mk/index.php/GEOLMAC/article/view/1010.