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\bibitem{Zarenia_etal2009} {\textquotedblleft}\textit{Electrostatically confined quantum rings in bilayer graphene}{\textquotedblright}. Zarenia M, Pereira JM, Peeters FM, Farias GA, Nano letters \textbf{9}, 4088 (2009).   http://doi.org/10.1021/nl902302m

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