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\bibitem{Callewaert_etal2016} {\textquotedblleft}\textit{Positron surface state as a spectroscopic probe for characterizing surfaces of topological insulator materials}{\textquotedblright}.  Callewaert V, Shastry K, Saniz R, Makkonen I, Barbiellini B, Assaf BA, Heiman D, Moodera JS, Partoens B, Bansil A, Weiss AH;, Physical review B \textbf{94}, 115411 (2016).   http://doi.org/10.1103/PHYSREVB.94.115411

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