Stafilov, Trajce, Robert Šajn, and Darko Bačvarovski. “Multivariate Factor Assessment for Lithogenic and Anthropogenic Distribution of Macro and Trace Elements in Water from Pčinja River Basin, North Macedonia”. Macedonian Journal of Ecology and Environment 23, no. 2 (December 31, 2021): 73–84. Accessed June 28, 2022. https://mjee.org.mk/index.php/mjee/article/view/164.