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\bibitem{Barbier_etal2012} {\textquotedblleft}\textit{Snake states and Klein tunneling in a graphene Hall bar with a pn-junction}{\textquotedblright}. Barbier M, Papp G, Peeters FM, Applied physics letters \textbf{100}, 163121 (2012).   http://doi.org/10.1063/1.4704667

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