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\bibitem{Barbier_etal2009} {\textquotedblleft}\textit{Bilayer graphene with single and multiple electrostatic barriers: band structure and transmission}{\textquotedblright}. Barbier M, Vasilopoulos P, Peeters FM, Pereira JM, Physical review : B : solid state \textbf{79}, 155402 (2009).   http://doi.org/10.1103/PhysRevB.79.155402

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