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\bibitem{Lopez-Honorez_etal2017} Lopez-Honorez, L., Mena, O., Palomares-Ruiz, S., \& Villanueva-Domingo, P. (2017). Warm dark matter and the ionization history of the Universe. \textit{Phys. Rev. D}, \textit{96}(10), 103539--14pp.

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