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\bibitem{Addazi_etal2016} Addazi, A., Valle, J. W. F., \& Vaquera-Araujo, C. A. (2016). String completion of an SU(3)(c) x SU(3)(L) x U(1)(X) electroweak model. \textit{Phys. Lett. B}, \textit{759}, 471--478.

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