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A. Kato; M. Yamazaki; H. Najafov; K. Iwai; A. Bayramov; C. Hidaka; T. Takizawa; S. Iida. (2003). Radiative and non-radiative processes of Ce related transitions in CaGa2S4 and SrGa2S4. , 64(9-10), 1511–1517. doi:10.1016/s0022-3697(03)00170-7 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research