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Silva Balcanica 23(1): 37-55
doi:
10.3897/silvabalcanica.22.e82756
Received:
25 Feb 2022 | Approved:
06 Apr 2022 | Published:
20 May 2022
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Authors
Nasko Iliev 
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University of Forestry, Sofia, Bulgaria
Executive Forest Agency, Sofia, Bulgaria
University of Forestry, 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.