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A.N. Georgobiani; V.V. Styrov; V.I. Tyutyunnikov; B.G. Tagiev; O.B. Tagiev; R.B. Djabbarov. (2003). Radical-recombination luminescence, ion-luminescence and photoluminescence of CaGa2S4:Eu. , 64(9-10), 1519–1524. doi:10.1016/s0022-3697(03)00140-9 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research