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Hai-Rui Xia; Huai-Dong Jiang; Ming Guo; Ji-Yang Wang; Jing-Qian Wei; Xiao-Bo Hu; Yao-Gang Liu. (2001).
Absorption and emission properties of erbium calcium oxyborate crystals. , 188(1-4), 233–238.
doi:10.1016/s0030-4018(00)01168-8
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research
