| Bulgarian Ship Hydrodynamics Centre | | Conducts research in ship and offshore hydrodynamics, coastal hydraulics, aerodynamics, environment, water transport and information technology. |
| IEEE Bulgaria | | Regional section of the institute of electrical and electronics engineers. |
| Wide Field Plate Database | | Contains the descriptive information for the astronomical wide-field (>1) photographic observations stored in numerous archives all over the world. | |
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