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\bibitem{Xavier_etal2010} {\textquotedblleft}\textit{Topological confinement in graphene bilayer quantum rings}{\textquotedblright}. Xavier LJP, Pereira JM, Chaves A, Farias GA, Peeters FM, Applied physics letters \textbf{96}, 212108 (2010).   http://doi.org/10.1063/1.3431618

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