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\bibitem{Villanueva-Domingo_etal2018} Villanueva-Domingo, P., Gariazzo, S., Gnedin, N. Y., \& Mena, O. (2018). Was there an early reionization component in our universe? \textit{J. Cosmol. Astropart. Phys.}, \textit{04}(4), 024--17pp.

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