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\bibitem{Barbier_etal2010} {\textquotedblleft}\textit{Single-layer and bilayer graphene superlattices: collimation, additional Dirac points and Dirac lines}{\textquotedblright}. Barbier M, Vasilopoulos P, Peeters FM, Philosophical transactions of the Royal Society : mathematical, physical and engineering sciences \textbf{368}, 5499 (2010).   http://doi.org/10.1098/rsta.2010.0218

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