Belkin, V.V., Fyodorov, F.V., Rykov, A.M. and Ilyukha, V.A. 2022. Phenological observations on protected natural areas associated with brown bear (Ursus arctos L.) ecology. Baltic Forestry. 27, 2 (Jan. 2022). DOI:https://doi.org/10.46490/BF618.