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2. G. A. Emel’chenko, A. N. Gruzintsev, M. N. Koval’chuk, V. M. Masalov, E. N. Samarov, E. E. Ekimov, K. Bartkhou, and I. I. Zver’kova, Fiz. Tekh. Poluprovodn. 39, 1375 (2005) [Semiconductors 39, 1328 (2005)].
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4. Yingling Yanga, Hongwei Yana, Zhengping Fua, Beifang Yanga, Linsheng Xiaa, Zhen Wanda, Jian Zuob, Shijun Yub, Shengquan Fub, and Fanqing Li, J. Luminecs. 124, 228 (2007).
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