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Fedoriak , M.M., Tymochko, L.I., Shkrobanets, O.O., Zhuk, A.V., Deli, O.F., Podobivskiy, S.S., Mikolaychuk, V.G., Kalynychenko, O.O., Leheta, U.V. and Zarochentseva, O.D. 2021. Results of Annual Monitoring of Honey Bee Colony Winter Losses in Ukraine: Winter 2019–2020. Visnyk of V. N. Karazin Kharkiv National University series «Еcоlogy». 25 (Nov. 2021), 111-124. DOI:https://doi.org/10.26565/1992-4259-2021-25-10.