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Abraham, J., M. Aglietta, C. Aguirre, D. Allard, I. Allekotte, P. Allison, C. Alvarez, J. Alvarez-Muniz, M. Ambrosio, L. Anchordoqui et al. "An upper limit to the photon fraction in cosmic rays above 10(19) eV from the Pierre Auger Observatory." ASTROPARTICLE PHYSICS 27, no. 2-3 (2007): 155–168.
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