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A. Bayramov; H. Najafov; A. Kato; M. Yamazaki; K. Fujiki; Md. Nazri; S. Iida. (2003). Feasibility of TFEL application of Ce-doped CaGa2S4 and SrGa2S4 films prepared by flash evaporation method. , 64(9-10), 1821–1824. doi:10.1016/s0022-3697(03)00198-7 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research