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\bibitem{Park_etal2013} {\textquotedblleft}\textit{The ageing effect in topological insulators : evolution of the surface electronic structure of Bi$_{2}$Se$_{3}$ upon K adsorption}{\textquotedblright}. Park K, De Beule C, Partoens B, New journal of physics \textbf{15}, 113031 (2013).   http://doi.org/10.1088/1367-2630/15/11/113031

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