Ivetić, Vladan, Ivona Kerkez, Ivan Denić, and Jovana Devetaković. “Variability of Beech Cupules in Serbia”. REFORESTA, no. 5 (July 10, 2018): 27–32. Accessed March 28, 2024. https://journal.reforestationchallenges.org/index.php/REFOR/article/view/87.