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\bibitem{Teodorescu_etal1997} {\textquotedblleft}\textit{High resolution TEM observation of in situ colloid formation in CaF$_{2}$ crystals}{\textquotedblright}. Teodorescu VS, Nistor LC, van Landuyt J, Materials science forum \textbf{239-241}, 671 (1997)

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