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| active galaxy markarian-421 (1) |
| agn jets (1) |
| bl lacertae objects : individual (markarian 421) (1) |
| bl-lacertae objects (1) |
| cherenkov telescopes (1) |
| energy (1) |
| extragalactic radio-sources (1) |
| galactic nuclei (1) |
| galaxies : active (1) |
| galaxies : jets (1) |