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\bibitem{PierreAugerCollaborationAbreu+Pastor2013} Pierre Auger Collaboration(Abreu, P. et al), \& Pastor, S. (2013). Interpretation of the depths of maximum of extensive air showers measured by the Pierre Auger Observatory. \textit{J. Cosmol. Astropart. Phys.}, \textit{02}(2), 026--20pp.

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