Forest Research Institute - BAS Sofia, Bulgaria
Forest Research Institute Sofia, Bulgaria
Institute of Biodiversity and Ecosystem Research Sofia, Bulgaria
National Museum of Natural History Sofia, Bulgaria
Forest Research Institute of B.A.S. Sofia, Bulgaria
University of Plovdiv "Paisii Hilendarski", Bulgaria Plovdiv, Bulgaria
National Museum of Natural History, Sofia 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
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