Grigorov B, Rusinko A, Vassilev K. An approach for studying changes in ecology: A beech forest case study from Pernik Province, Western Bulgaria. BJAS [Internet]. 2024 Dec. 13 [cited 2026 Oct. 26];30(Supplement 1):90-6. Available from: https://agriacad.eu/ojs/index.php/bjas/article/view/1087