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115 Astronomy and space science (1)
213 Electronic, automation and communications engineering, electronics (1)
3C 454.3 (1)
acceleration of particles (1)
ACTIVE GALAXY MARKARIAN-421 (1)
BL Lacertae objects: general (1)
BL Lacertae objects: individual (Mrk 421) (1)
BL-LACERTAE OBJECTS (1)
BLACK-HOLE MASSES (1)
CRAB-NEBULA (1)

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