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Kanata, T.; Matsunaga, M.; Takakura, H.; Hamakawa, Y.; Nishino, T. . (1991). Deep-level characterization of n-type GaAs by photoreflectance spectroscopy. Journal of Applied Physics, 69(6), 3691–. doi:10.1063/1.348486 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research