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\bibitem{VanPottelberge_etal2018} {\textquotedblleft}\textit{Electrical dipole on gapped graphene : bound states and atomic collapse}{\textquotedblright}. Van Pottelberge R, Van Duppen B, Peeters FM, Physical review B \textbf{98}, 165420 (2018).   http://doi.org/10.1103/PHYSREVB.98.165420

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