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Gao, W L; Xie, G Q; Ma, J; Liu, M N; Yuan, P; Qian, L J; Yu, H H; Zhang, H J; Wang, J Y; Zhang, J . (2013). Spectroscopic characteristics and efficient laser operation of Tm:CLNGG disordered crystal. Laser Physics Letters, 10(5), 055809–. doi:10.1088/1612-2011/10/5/055809 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research