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Journal of the Bulgarian Geographical Society 39: 64-67
doi:
10.3897/jbgs.2018.39.12
Published:
13 Nov 2018
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Sofia University "St. Kl. Ohridski", Sofia, Bulgaria
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Conflict of interest
The author has 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.
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