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Silva Balcanica 23(1): 11-19
doi:
10.3897/silvabalcanica.23.e79249
Received:
12 Dec 2021 | Approved:
26 Jan 2022 | Published:
18 Mar 2022
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Authors
Dimitar Petrov Dimitrov 
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Forest Research Institute, Bulgarian Academy of Sciences, Sofia, Bulgaria
Forest Research Institute, Bulgarian Academy of Sciences, Sofia, Bulgaria
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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.