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\bibitem{LHCfCollaborationAdriani_etal2011} LHCf Collaboration(Adriani, O. et al), Faus-Golfe, A., \& Velasco, J. (2011). Measurement of zero degree single photon energy spectra for sqrt(s) = 7 TeV proton-proton collisions at LHC. \textit{Phys. Lett. B}, \textit{703}(2), 128--134.

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