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| active galaxy markarian-421 (1) |
| bl lacertae objects : individual (markarian 421) (1) |
| blazars (1) |
| bursts (1) |
| emission (1) |
| galaxies : active (1) |
| galaxies : jets (1) |
| gamma rays : observations (1) |
| jets (1) |
| lacertae object markarian-421 (1) |