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\bibitem{Deppisch_etal2016} Deppisch, F. F., Hati, C., Patra, S., Sarkar, U., \& Valle, J. W. F. (2016). 331 models and grand unification: From minimal SU(5) to minimal SU(6). \textit{Phys. Lett. B}, \textit{762}, 432--440.

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