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\bibitem{Witte_etal2018} Witte, S., Villanueva-Domingo, P., Gariazzo, S., Mena, O., \& Palomares-Ruiz, S. (2018). EDGES result versus CMB and low-redshift constraints on ionization histories. \textit{Phys. Rev. D}, \textit{97}(10), 103533--8pp.

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