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\bibitem{Zhang_etal2016} {\textquotedblleft}\textit{Effect of cation dopant radius on the hydrothermal stability of tetragonal zirconia: Grain boundary segregation and oxygen vacancy annihilation}{\textquotedblright}. Zhang F, Batuk M, Hadermann J, Manfredi G, Mari{\"e}n A, Vanmeensel K, Inokoshi M, Van Meerbeek B, Naert I, Vleugels J, Acta materialia \textbf{106}, 48 (2016).   http://doi.org/10.1016/j.actamat.2015.12.051

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