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\bibitem{Kuznetsov_etal2012} {\textquotedblleft}\textit{Effect of heat-treatment on luminescence and structure of Ag nanoclusters doped oxyfluoride glasses and implication for fiber drawing}{\textquotedblright}. Kuznetsov AS, Cuong NT, Tikhomirov VK, Jivanescu M, Stesmans A, Chibotaru LF, Vel{\'a}zquez JJ, Rodr{\'\i}guez VD, Kirilenko D, Van Tendeloo G, Moshchalkov VV, Optical materials \textbf{34}, 616 (2012).   http://doi.org/10.1016/j.optmat.2011.09.007

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