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D.H. An; K.U. Kang; B.G. Lee; J.B. Lim; S.U. Jang; K.S. Baek; H.N. Oak. (2003). Mössbauer study of Zn0.4Cu0.6Fe1.2Cr0.8O4. , 64(12), 2351–2355. doi:10.1016/s0022-3697(03)00271-3 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research