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    bl lacertae objects (1)
    bl lacertae objects: general (1)
    crab-nebula (1)
    fermi-lat (1)
    galaxies: individual (markarian 501) (1)
    gamma-ray emission (1)
    large-area telescope (1)
    log-parabolic spectra (1)
    magic telescope (1)
    multiwavelength observations (1)