April 25, 1966 article End to the Cosmic-Ray Spectrum? Physical Review Letters DOI: 10.1103/physrevlett.16.748 OpenAlex Authors 0 Author list not loaded yet. Cited by 21 stored of 2,983 Search Sort Most cited Newest Oldest Patent citations Title Any typearticle review book-chapter conference-paper preprint dissertation book dataset other Any fieldAgricultural and Biological Sciences Arts and Humanities Biochemistry, Genetics and Molecular Biology Business, Management and Accounting Chemical Engineering Chemistry Computer Science Decision Sciences Dentistry Earth and Planetary Sciences Economics, Econometrics and Finance Energy Engineering Environmental Science Health Professions Immunology and Microbiology Materials Science Mathematics Medicine Neuroscience Nursing Pharmacology, Toxicology and Pharmaceutics Physics and Astronomy Psychology Social Sciences Veterinary Open access Search for Extremely-High-Energy Neutrinos and First Constraints on the Ultrahigh-Energy Cosmic-Ray Proton Fraction with IceCube 2025 Physical Review Letters article Physics and Astronomy Astrophysics and Cosmic Phenomena Open access 36 citations Probing the PeV region in the astrophysical neutrino spectrum using ν μ from the Southern sky 2025 Physical review. 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