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Silva Balcanica 22(3): 17-27
doi:
10.3897/silvabalcanica.22.e78600
Received:
29 Nov 2021 | Approved:
05 Dec 2021 | Published:
14 Dec 2021
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Authors
Georgi Georgiev 
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- Corresponding author
Forest Research Institute, Bulgarian Academy of Sciences, Sofia, Bulgaria
Forest Research Institute, Bulgarian Academy of Sciences, Sofia, Bulgaria
Forest Research Institute, Bulgarian Academy of Sciences, Sofia, Bulgaria
Forest Research Institute, Bulgarian Academy of Sciences, Sofia, Bulgaria
Forest Research Institute, Bulgarian Academy of Sciences, Sofia, Bulgaria
Forest Research Institute, Bulgarian Academy of Sciences, Sofia, Bulgaria
Forest Research Institute, Bulgarian Academy of Sciences, Sofia, Bulgaria
Executive Forests Agency, Sofia, Sofia, Bulgaria
Forest Protection Station, Varna, Varna, Bulgaria
Ilian Mutafchiiski
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- Corresponding author
Forest Protection Station, Sofia, Sofia, Bulgaria
Academic editor
Forest Research Institute, Sofia, Bulgaria
Conflict of interest
The authors have declared that no competing interests exist.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.