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| active galactic nuclei (1) |
| background-radiation (1) |
| bl lacertae objects (1) |
| bl lacertae objects: individual (markarian 421) (1) |
| correlated variability (1) |
| electron acceleration (1) |
| galaxies: active (1) |
| gamma rays: general (1) |
| lac objects (1) |
| large-area telescope (1) |