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2. G. Raffelt, Proc. Nobel Symposium 129: Neutrino Physics (hep-ph/0501049), and references therein
3. F. Halzen, Proc. Nobel Symposium 129: Neutrino Physics (astro-ph/0501593), and references therein
4. Observations and implications of the ultrahigh-energy cosmic rays
5. Measurement of the Cosmic‐Ray Energy Spectrum and Composition from 1017to 1018.3eV Using a Hybrid Technique