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Journal of the Bulgarian Geographical Society 44: 21-24
doi:
10.3897/jbgs.e66377
Received:
23 Mar 2021 | Approved:
03 Jun 2021 | Published:
09 Jul 2021
This article is part of:
Authors
Borislav Grigorov 
- Corresponding author
- Corresponding author
Sofia University, Sofia, Bulgaria
Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences, Sofia, Bulgaria
Sofia University, Sofia, Bulgaria
Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences, Sofia, Bulgaria
FCG Povvik Ltd., Sofia, Bulgaria
University of Plovdiv, Plovdiv, Bulgaria
Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences, Sofia, Bulgaria
Academic editor
National Institute of Geophysics, Geodesy and Geography - Bulgarian Academy of Sciences, Sofia, Bulgaria
Conflict of interest
The authors have declared that no competing interests exist.
Supporting agencies
This investigation was carried with the financial help of the national scientific programme “Young scientists and Postdoctoral students” for 2019, contract № 22-0078/ 22.04.2019 and the National Science Fund (Contract ДКОСТ 01/7/19.10.2018).
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.
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