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\bibitem{Zhu_etal2012} {\textquotedblleft}\textit{Electron-phonon bound states in graphene in a perpendicular magnetic field}{\textquotedblright}. Zhu J, Badalyan SM, Peeters FM, Physical review letters \textbf{109}, 256602 (2012).   http://doi.org/10.1103/PhysRevLett.109.256602

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