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\bibitem{daCosta_etal2016} {\textquotedblleft}\textit{Hexagonal-shaped monolayer-bilayer quantum disks in graphene : a tight-binding approach}{\textquotedblright}. da Costa, Zarenia M, Chaves A, Pereira JM Jr, Farias GA, Peeters FM, Physical review B \textbf{94}, 035415 (2016).   http://doi.org/10.1103/PhysRevB.94.035415

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