Vasileva, Katica, Trajče Stafilov, and Liljana Ralevska. “Pollution of the Air in the North Part of Skopje by S02 and Smoke”. Macedonian Journal of Ecology and Environment 1, no. 1-2 (December 31, 1993): 63–68. Accessed December 28, 2024. http://mjee.org.mk/index.php/mjee/article/view/9.