National Institute of Geophysics, Geodesy and Geography - Bulgarian Academy of Sciences Sofia, Bulgaria
National Institute of Geophysics, Geodesy and Geography - Bulgarian Academy of Sciences Sofia, Bulgaria http://niggg.bas.bg
"St. Cyril and St. Methodius" University of Veliko Tarnovo Veliko Tarnovo, Bulgaria
University of North Carolina Chapel Hill, United States of America https://pickles.web.unc.edu/
Sofia University "St. Kliment Ohridski" Sofia, Bulgaria
Faculty of Chemistry, Biology and Geography, West University of Timisoara, Romania Timisoara, Romania
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