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I.A. Souza; L.S. Cavalcante; J.C. Sczancoski; F. Moura; C.O. Paiva-Santos; J.A. Varela; A.Z. Simões; E. Longo. (2009). Structural and dielectric properties of Ba0.5Sr0.5(SnxTi1−x)O3 ceramics obtained by the soft chemical method. , 477(1-2), 0–882. doi:10.1016/j.jallcom.2008.11.042 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research