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\bibitem{Arrighi_etal2018} Arrighi, P., Di Molfetta, G., Marquez-Martin, I., \& Perez, A. (2018). Dirac equation as a quantum walk over the honeycomb and triangular lattices. \textit{Phys. Rev. A}, \textit{97}(6), 062111--5pp.

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