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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) |