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\bibitem{DiValentino_etal2014} Di Valentino, E., Giusarma, E., Lattanzi, M., Melchiorri, A., \& Mena, O. (2014). Axion cold dark matter: Status after Planck and BICEP2. \textit{Phys. Rev. D}, \textit{90}(4), 043534--11pp.

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