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\bibitem{Chen+VanTendeloo1999} {\textquotedblleft}\textit{Microstructure of tough polycrystalline natural diamond}{\textquotedblright}. Chen JH, Van Tendeloo G, Journal of electron microscopy \textbf{48}, 121 (1999).   http://doi.org/10.1093/oxfordjournals.jmicro.a023658

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