132 citations · 178 across the 7 of their papers we have counts for
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H. Falcke, W. D. Apel, A. F. Badea
The nature of ultrahigh-energy cosmic rays (UHECRs) at energies >10^20 eV remains a mystery. They are likely to be of extragalactic origin, but should be absorbed within ~50 Mpc th…