| 1 (1820) | Bulgarian Academy of Sciences * | BGR | |
| 2 (2459) | Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences | BGR | |
| 3 (5180) | Institute of Mathematics and Informatics Bulgarian Academy of Sciences | BGR | |
| 4 (5565) | Institute of Biodiversity and Ecosystems Research Bulgarian Academy of Sciences | BGR | |
| 5 (5832) | Institute of Organic Chemistry with Centre of Phytochemistry Bulgarian Academy of Sciences | BGR | |
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