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Xiaofeng Liu, Yingzhi Chi, Guoping Dong, E. Wu, Yanbo Qiao, Heping Zeng, and Jianrong Qiu, "Optical gain at 1550 nm from colloidal solution of Er3+-Yb3+ codoped NaYF4 nanocubes," Opt. Express 17, 5885-5890 (2009)