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\bibitem{Wu_etal2010} {\textquotedblleft}\textit{Electron tunneling through double magnetic barriers on the surface of a topological insulator}{\textquotedblright}. Wu Z, Peeters FM, Chang K, Physical review : B : condensed matter and materials physics \textbf{82}, 115211 (2010).   http://doi.org/10.1103/PhysRevB.82.115211

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