| 1 (491) | Bulgarian Academy of Sciences * | BGR | |
| 2 (537) | Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences | BGR | |
| 3 (639) | Georgi Nadjakov Institute of Solid State Physic Bulgarian Academy of Sciences | BGR | |
| 4 (689) | Academician Emil Djakov Institute of Electronics Bulgarian Academy of Sciences | BGR | |
|