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\bibitem{MiltonPereira_etal2006} {\textquotedblleft}\textit{Confined states and direction-dependent transmission in graphene quantum wells}{\textquotedblright}. Milton Pereira J, Mlinar V, Peeters FM, Vasilopoulos P, Physical review : B : condensed matter and materials physics \textbf{74}, 045424 (2006).   http://doi.org/10.1103/PhysRevB.74.045424

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