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| active galactic nuclei (2) |
| background-radiation (1) |
| bl lacertae objects (1) |
| bl lacertae objects: individual (markarian 421) (2) |
| bl-lacertae objects (1) |
| blazars (1) |
| correlated variability (2) |
| electron acceleration (1) |
| emission (1) |
| galaxies: active (2) |