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\bibitem{Govaerts_etal2014} {\textquotedblleft}\textit{Effect of Bi bilayers on the topological states of Bi$_{2}$Se$_{3}$ : a first-principles study}{\textquotedblright}. Govaerts K, Park K, De Beule C, Partoens B, Lamoen D, Physical review : B : condensed matter and materials physics \textbf{90}, 155124 (2014).   http://doi.org/10.1103/PhysRevB.90.155124

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