Balabanova, Biljana, Trajče Stafilov, Katerina Bačeva, and Robert Šajn. 2013. “Atmospheric Pollution With Copper Around the Copper Mine and Flotation, Bučim, Republic of Macedonia, Using Biomonitoring Moss and Lichen Technique”. Geologica Macedonica 23 (April), pp.35-41. https://js.ugd.edu.mk/index.php/GEOLMAC/article/view/240.