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Bashkin, I. O.; Fedotov, V. K.; Nefedova, M. V.; Tissen, V. G.; Ponyatovsky, E. G.; Schiwek, A.; Holzapfel, W. B. . (2003). Crystal structure and superconductivity of TiZr up to 57 GPa. Physical Review B, 68(5), 054401–. doi:10.1103/physrevb.68.054401 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research