“Results of Standardized Beekeeper Survey of Honey Bee Colony Losses in Ukraine for Winter 2018-2019”. Visnyk of V. N. Karazin Kharkiv National University. Series Еcоlogy, no. 23 (November 28, 2020): 124–138. Accessed October 25, 2026. https://periodicals.karazin.ua/ecology/article/view/16439.