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\bibitem{Zhang_etal2017} {\textquotedblleft}\textit{Grain-boundary engineering for aging and slow-crack-growth resistant zirconia}{\textquotedblright}. Zhang F, Chevalier J, Olagnon C, Batuk M, Hadermann J, Van Meerbeek B, Vleugels J, Journal of dental research \textbf{96}, 774 (2017).   http://doi.org/10.1177/0022034517698661

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