Živanović, Kristina, and Dušan Jokanović. “Variability of Morpho-Anatomical Features of Black Pine Needles at the Area of Jastrebac and Goč”. REFORESTA, no. 15 (July 4, 2023): 4–11. Accessed January 21, 2025. https://journal.reforestationchallenges.org/index.php/REFOR/article/view/173.