| 1 (1217) | Bulgarian Academy of Sciences * | BGR | |
| 2 (1279) | Institute of Organic Chemistry with Centre of Phytochemistry Bulgarian Academy of Sciences | BGR | |
| 3 (1612) | Stephan Angeloff Institute of Microbiology Bulgarian Academy of Sciences | BGR | |
| 4 (1849) | Institute of Biodiversity and Ecosystems Research Bulgarian Academy of Sciences | BGR | |
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