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\bibitem{Xiao_etal2013} {\textquotedblleft}\textit{Optoelectronic properties of ABC-stacked trilayer graphene}{\textquotedblright}. Xiao YM, Xu W, Zhang YY, Peeters FM, Physica status solidi: B: basic research \textbf{250}, 86 (2013).   http://doi.org/10.1002/pssb.201248169

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