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\bibitem{Sena_etal2011} {\textquotedblleft}\textit{Landau levels in asymmetric graphene trilayer}{\textquotedblright}. Sena SHR, Pereira JM, Peeters FM, Farias GA, Physical review : B : condensed matter and materials physics \textbf{84}, 205448 (2011).   http://doi.org/10.1103/PhysRevB.84.205448

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