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\bibitem{Tikhomirov_etal2012} {\textquotedblleft}\textit{Optimizing Er/Yb ratio and content in Er-Yb co-doped glass-ceramics for enhancement of the up- and down-conversion luminescence}{\textquotedblright}. Tikhomirov VK, Rodr{\'\i}guez VD, M{\'e}ndez-Ramos J, del- Castillo J, Kirilenko D, Van Tendeloo G, Moshchalkov VV, Solar energy materials and solar cells \textbf{100}, 209 (2012).   http://doi.org/10.1016/j.solmat.2012.01.019

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