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Silva Balcanica 21(1): 41-46
doi:
10.3897/silvabalcanica.21.e54699
Received:
10 Mar 2020 | Approved:
12 Apr 2020 | Published:
30 Jun 2020
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Authors
AgroBioInstitute, Agricultural Academy, Sofia, Bulgaria
AgroBioInstitute, Agricultural Academy, Sofia, Bulgaria
Institute of Applied Biosciences, Centre for Research and Technology Hellas, Thessaloniki, Greece
Institute of Applied Biosciences, Centre for Research and Technology Hellas, Thessaloniki, Greece
AgroBioInstitute, Agricultural Academy, Sofia, Bulgaria
Ivan Atanasov 
- Corresponding author
- Corresponding author
AgroBioInstitute, Agricultural Academy, 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.