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\bibitem{Cavalcante_etal2016} {\textquotedblleft}\textit{All-strain based valley filter in graphene nanoribbons using snake states}{\textquotedblright}. Cavalcante LS, Chaves A, da Costa DR, Farias GA, Peeters FM, Physical review B \textbf{94}, 075432 (2016).   http://doi.org/10.1103/PHYSREVB.94.075432

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