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\bibitem{Mangano_etal2011} Mangano, G., Miele, G., Pastor, S., Pisanti, O., \& Sarikas, S. (2011). Constraining the cosmic radiation density due to lepton number with Big Bang Nucleosynthesis. \textit{J. Cosmol. Astropart. Phys.}, \textit{03}(3), 035--18pp.

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