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3c 454.3 (1) |
acceleration of particles (1) |
active galactic nucleus (1) |
bl lacertae objects: general (1) |
bl lacertae objects: individual (mrk 421) (1) |
bl-lacertae objects (1) |
black-hole masses (1) |
crab-nebula (1) |
galaxies: active (1) |
gamma rays: general (1) |