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\bibitem{DiValentino_etal2023} Di Valentino, E., Gariazzo, S., Giare, W., Melchiorri, A., Mena, O., \& Renzi, F. (2023). Novel model-marginalized cosmological bound on the QCD axion mass. \textit{Phys. Rev. D}, \textit{107}(10), 103528--16pp.

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