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Journal of the Bulgarian Geographical Society 45: 61-66
doi:
10.3897/jbgs.e72766
Received:
10 Aug 2021 | Approved:
23 Oct 2021 | Published:
29 Dec 2021
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Authors
Miglena Kircheva Zhiyanski 
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- Corresponding author
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
National Institute of Geophysics, Geodesy and Geography - Bulgarian Academy of Sciences, Sofia, Bulgaria
Sofia University "St. Kliment Ohridski", 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
The work is realized within the project "Creation of an innovative concept, flexible methodology and pilot digital model of a geospatially linked platform for access to the natural element of the Bulgarian heritage" implemented by NIGGG - BAS, SU "St. Kliment Ohridski" and FRI-BAS – contract № BG05M2OP001-1.001-0001 "CREATION AND DEVELOPMENT OF CENTRE OF EXCELLENCE "HERITAGE BG", funded by OP SEID 2014-2020, co-funded by European fund for regional development.
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.