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\bibitem{Mena_etal2011} Mena, O., Razzaque, S., \& Villaescusa-Navarro, F. (2011). Signatures of photon and axion-like particle mixing in the gamma-ray burst jet. \textit{J. Cosmol. Astropart. Phys.}, \textit{02}(2), 030--16pp.

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