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\bibitem{Shakouri_etal2013} {\textquotedblleft}\textit{Helical liquid of snake states}{\textquotedblright}. Shakouri K, Badalyan SM, Peeters FM, Physical review : B : condensed matter and materials physics \textbf{88}, 195404 (2013).   http://doi.org/10.1103/PhysRevB.88.195404

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