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\bibitem{Barbier_etal2009} {\textquotedblleft}\textit{Band structure, density of states, and transmission in graphene bilayer superlattices}{\textquotedblright}. Barbier M, Vasilopoulos P, Peeters FM, Pereira JM, AIP conference proceedings \textbf{1199}, 547 (2009).   http://doi.org/10.1063/1.3295550

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