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| active galactic nuclei (1) |
| bl lacertae objects: individual (markarian 421) (1) |
| bl-lacertae objects (1) |
| blazars (1) |
| correlated variability (1) |
| emission (1) |
| galaxies: active (1) |
| gamma rays: general (1) |
| lac objects (1) |
| markarian-421 (1) |