Davydenko, K. V., and D. O. Baturkin. “Pine Engraver Beetle Ips Acuminatus As a Potential Vector of Sphaeropsis Sapinea”. Forestry and Forest Melioration, no. 136 (June 25, 2020): 149–156. Accessed April 15, 2021. http://forestry-forestmelioration.org.ua/index.php/journal/article/view/268.