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\bibitem{Tikhomirov_etal2012} {\textquotedblleft}\textit{Luminescence of oxyfluoride glasses co-doped with Ag nanoclusters and Yb$^{3+}$ ions}{\textquotedblright}. Tikhomirov VK, Vosch T, Fron E, Rodr{\'\i}guez VD, Vel{\'a}zquez JJ, Kirilenko D, Van Tendeloo G, Hofkens J, Van der Auweraer M, Moshchalkov VV, RSC advances \textbf{2}, 1496 (2012).   http://doi.org/10.1039/c1ra01026c

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