“Results of Standardized Beekeeper Survey of Honey Bee Colony Losses in Ukraine for Winter 2018-2019”. 2020. Visnyk of V. N. Karazin Kharkiv National University. Series Еcоlogy, no. 23 (November): 124-38. https://doi.org/10.26565/1992-4259-2020-23-11.