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\bibitem{Dong_etal2018} Dong, P. V., Huong, D. T., Queiroz, F. S., Valle, J. W. F., \& Vaquera-Araujo, C. A. (2018). The dark side of flipped trinification. \textit{J. High Energy Phys.}, \textit{04}(4), 143--31pp.

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