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\bibitem{VanPottelberge_etal2017} {\textquotedblleft}\textit{Graphene quantum dot with a Coulomb impurity : subcritical and supercritical regime}{\textquotedblright}. Van Pottelberge R, Zarenia M, Vasilopoulos P, Peeters FM, Physical review B \textbf{95}, 245410 (2017).   http://doi.org/10.1103/PHYSREVB.95.245410

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