Milev, Milko, Krasimira Petkova, and Nasko Iliev. “Afforestation in Bulgaria”. REFORESTA, no. 3 (July 1, 2017): 143–154. Accessed March 28, 2024. https://www.reforestationchallenges.org/REFOR/index.php/REFOR/article/view/60.