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Silva Balcanica 22(2): 91-102
doi:
10.3897/silvabalcanica.22.e77233
Received:
28 Oct 2021 | Approved:
02 Nov 2021 | Published:
19 Nov 2021
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Authors
Margarita Georgieva 
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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
University of Forestry, Sofia, Bulgaria
University of Forestry, Sofia, Bulgaria
University of Forestry, Sofia, Bulgaria
Sofia University 'St. Kliment Ohridski', Sofia, Bulgaria
Sofia University 'St. Kliment Ohridski', Sofia, Bulgaria
Geographica Ltd., 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.