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\bibitem{Shestakov_etal2011} {\textquotedblleft}\textit{Quantum cutting in Li (770 nm) and Yb (1000 nm) co-dopant emission bands by energy transfer from the ZnO nano-crystalline host}{\textquotedblright}. Shestakov MV, Tikhomirov VK, Kirilenko D, Kuznetsov AS, Chibotaru LF, Baranov AN, Van Tendeloo G, Moshchalkov VV, Optics express \textbf{19}, 15955 (2011).   http://doi.org/10.1364/OE.19.015955

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