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    • EBL inhomogeneity and hard-spectrum gamma-ray sources 

      Abdalla, Hassan; Böttcher, Markus (IOP Publishing, 2017)
      The unexpectedly hard very-high-energy (VHE; E > 100 GeV) γ-ray spectra of a few distant blazars have been interpreted as evidence of a reduction of the γγ opacity of the universe due to the interaction of VHE γ-rays with ...