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\bibitem{daCosta_etal2017} {\textquotedblleft}\textit{Valley filtering in graphene due to substrate-induced mass potential}{\textquotedblright}. da Costa DR, Chaves A, Farias GA, Peeters FM, Journal of physics : condensed matter \textbf{29}, 215502 (2017).   http://doi.org/10.1088/1361-648X/AA6B24

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