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Zhu, Zhenmin; Xu, Xin; Peng, Bo; Yuan, Jie . (2019). Modeling and design of diffuse transmissive free-form surface based on LED collimation effect. Optics & Laser Technology, 119(), 105628–. doi:10.1016/j.optlastec.2019.105628 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research