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B. Harihara Venkataraman; K.B.R. Varma. (2003). Impedance and dielectric studies of ferroelectric SrBi2Nb2O9 ceramics. , 64(11), 2105–2112. doi:10.1016/s0022-3697(03)00263-4 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research