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\bibitem{Avetisyan_etal2009} {\textquotedblleft}\textit{Electric-field control of the band gap and Fermi energy in graphene multilayers by top and back gates}{\textquotedblright}. Avetisyan AA, Partoens B, Peeters FM, Physical review : B : solid state \textbf{80}, 195401 (2009).   http://doi.org/10.1103/PhysRevB.80.195401

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