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\bibitem{Masir_etal2010} {\textquotedblleft}\textit{Kronig-Penney model of scalar and vector potentials in graphene}{\textquotedblright}. Masir MR, Vasilopoulos P, Peeters FM, Journal of physics : condensed matter \textbf{22}, 465302 (2010).   http://doi.org/10.1088/0953-8984/22/46/465302

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