National Institute of Geophysics, Geodesy and Geography - Bulgarian Academy of Sciences Sofia, Bulgaria
Sofia University "St. Kliment Ohridski" Sofia, Bulgaria
National Institute of Geophysics, Geodesy and Geography - Bulgarian Academy of Sciences Sofia, Bulgaria http://niggg.bas.bg
Institute of Geography, Romanian Academy Bucharest, Romania
Sofia University "St.Kliment Ohridski" Sofia, Bulgaria
University of North Carolina Chapel Hill, United States of America https://pickles.web.unc.edu/
South-West University "Neofit Rilski" Blagoevgrad, Bulgaria
Space Research and Technology Institute - Bulgarian Academy of Sciences Sofia, Bulgaria
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