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\bibitem{DeBeule+Partoens2013} {\textquotedblleft}\textit{Gapless interface states at the junction between two topological insulators}{\textquotedblright}. De Beule C, Partoens B, Physical review : B : condensed matter and materials physics \textbf{87}, 115113 (2013).   http://doi.org/10.1103/PhysRevB.87.115113

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