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\bibitem{Li_etal2017} {\textquotedblleft}\textit{Exciton states in a circular graphene quantum dot: Magnetic field induced intravalley to intervalley transition}{\textquotedblright}. Li LL, Zarenia M, Xu W, Dong HM, Peeters FM, Physical review B \textbf{95}, 045409 (2017).   http://doi.org/10.1103/PHYSREVB.95.045409

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