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O.M. Berdychevsky; R.G. Gnyp; K.K. Maximovych; M.S. Pidzyrailo. (2001). Optical and spectral properties of the Tl2ZnI4 and Tl2ZnI4:Mn crystals. , 195(5-6), 443–448. doi:10.1016/s0030-4018(01)01346-3 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research