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\bibitem{Tian_etal2011} {\textquotedblleft}\textit{Stability of Ni in nitinol oxide surfaces}{\textquotedblright}. Tian H, Schryvers D, Liu D, Jiang Q, van Humbeeck J, Acta biomaterialia \textbf{7}, 892 (2011).   http://doi.org/10.1016/j.actbio.2010.09.009

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