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\bibitem{Krsmanovic_etal2008} {\textquotedblleft}\textit{Structural characterization of Er-doped Li$_{2}$O-Al$_{2}$O$_{3}$-SiO$_{2}$ glass ceramics}{\textquotedblright}. Krsmanovic R, Bals S, Bertoni G, Van Tendeloo G, Optical materials \textbf{30}, 1183 (2008).   http://doi.org/10.1016/j.optmat.2007.05.045

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