University of Santiago de Compostela Lugo , Spain
Institute of Plant Protection Sesto Fiorentino, Italy
National Heart Hospital Sofia, Bulgaria
University of the West of Scotland Paisley , United Kingdom
Bulgarian Academy of Sciences Sofia, Bulgaria
Institute of Biodiversity and Ecosystem Research Sofia, Bulgaria
Hellenic Agricultural Organization "DIMITRA" Institute of Mediterranean Forest Ecosystems Athens, Greece
NARIC Forest Research Institure Mátrafüred, Hungary
University of Forestry Sofia, Bulgaria
Institute of Forest Ecology Zvolen , Slovakia
University Botanic Gardens Sofia, Bulgaria
Mendel University Brno, Czech Republic
Institute of Forestry Belgrade, Serbia
Institute of Geophysics, Geography and Geodesy Sofia, Bulgaria
Pushkarov Institute of Soil Science Sofia, Bulgaria
University of Ljubljana Ljubljana, Slovenia
National Museum of Natural History Sofia, Bulgaria
Aristotle University of Thessaloniki Thessaloniki, Greece
Insitute of Agroenvironmental and Forest Biology Porano , Italy
Sofia University “St. Kliment Ohridski” Sofia, Bulgaria
Institute of Forestry Belgrade , Serbia
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