Poposka, Filimena, and Kostadin Nikolovski. “Entstehung, Umsetzung Und Wirkungvon Stickoxiden. II Teil”. Macedonian Journal of Ecology and Environment 6, no. 1-2 (December 31, 1999): 45–52. Accessed May 6, 2024. http://mjee.org.mk/index.php/mjee/article/view/144.