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\bibitem{ATLASCollaborationAaboud_etal2018} ATLAS Collaboration(Aaboud, M. et al), Alvarez Piqueras, D., Barranco Navarro, L., Cabrera Urban, S., Castillo Gimenez, V., Cerda Alberich, L., et al. (2018). Measurement of the production cross section of three isolated photons in pp collisions at root s=8 TeV using the ATLAS detector. \textit{Phys. Lett. B}, \textit{781}, 55--76.

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