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\bibitem{Bru_etal2016} Bru, L. A., de Valcarcel, G. J., Di Molfetta, G., Perez, A., Roldan, E., \& Silva, F. (2016). Quantum walk on a cylinder. \textit{Phys. Rev. A}, \textit{94}(3), 032328--7pp.

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