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T. Kato; K. Usami; J. Kuniya; S. Matsuda. (1988). Effects of Hydrogen Ion Implantation on Superconductivity in YBa2Cu3O7-x. , (), –. doi:10.1143/JJAP.27.L1104 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research