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\bibitem{Wang_etal2021} {\textquotedblleft}\textit{Confinement and edge effects on atomic collapse in graphene nanoribbons}{\textquotedblright}. Wang J, Van Pottelberge R, Jacobs A, Van Duppen B, Peeters FM, Physical Review B \textbf{103}, 035426 (2021).   http://doi.org/10.1103/PHYSREVB.103.035426

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