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Silva Balcanica 21(2): 35-44
doi:
10.3897/silvabalcanica.21.e55699
Received:
23 Jun 2020 | Approved:
07 Jul 2020 | Published:
06 Oct 2020
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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
Forest Research Institute, Bulgarian Academy of Sciences, Sofia, Bulgaria
University of Plovdiv , Plovdiv, Bulgaria
Academic editor
Forest Research Institute of B.A.S., 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.