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\bibitem{daCosta_etal2014} {\textquotedblleft}\textit{Analytical study of the energy levels in bilayer graphene quantum dots}{\textquotedblright}. da Costa DR, Zarenia M, Chaves A, Farias GA, Peeters FM, Carbon \textbf{78}, 392 (2014).   http://doi.org/10.1016/j.carbon.2014.06.078

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