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Natural SciencesAstronomyPhysicsAstrophysicsNuclear PhysicsParticle PhysicsAstroparticle PhysicsCosmic-ray InteractionsGalactic NucleiHigh-energy Astrophysical SourcesNucleosynthesisActive Galactic Nuclei ContributionActive Galactic Nucleus ContributionActive Galaxy NucleiCosmic-ray AccelerationGalactic Cosmic RaysNeutrino AstronomyParticle AccelerationParticle Acceleration Mechanisms
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Radiative processes in astrophysics
Astronomy Quarterly · 1979 · 3K citations
The Origin of Ultra-High-Energy Cosmic Rays
A. M. Hillas · Annual Review of Astronomy and Astrophysics · 1984 · 1.3K citations
Natural Sciences, Astronomy, Physics +12
Detection of TeV photons from the active galaxy Markarian 421
M. Punch, C. W. Akerlof, M. F. Cawley et al. · Nature · 1992 · 777 citations · Full text