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\bibitem{Li_etal2017} {\textquotedblleft}\textit{Gallium bismuth halide GaBi-X$_{2}$ (X = I, Br, Cl) monolayers with distorted hexagonal framework: Novel room-temperature quantum spin Hall insulators}{\textquotedblright}. Li L, Leenaerts O, Kong X, Chen X, Zhao M, Peeters FM, Nano Research \textbf{10}, 2168 (2017).   http://doi.org/10.1007/S12274-017-1464-Z

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