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\bibitem{Wang_etal2002} {\textquotedblleft}\textit{Spin-current modulation and square-wave transmission through periodically stubbed electron waveguides}{\textquotedblright}. Wang XF, Vasilopoulos P, Peeters FM, Physical review : B : condensed matter and materials physics \textbf{65}, 165217 (2002).   http://doi.org/10.1103/PhysRevB.65.165217

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