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\bibitem{Kong_etal2017} {\textquotedblleft}\textit{New group-V elemental bilayers : a tunable structure model with four-, six-, and eight-atom rings}{\textquotedblright}. Kong X, Li L, Leenaerts O, Liu X-J, Peeters FM, Physical review B \textbf{96}, 035123 (2017).   http://doi.org/10.1103/PHYSREVB.96.035123

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