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V. Guillen-viallet; J. Marucco; D. Colson. (2000). Thermodynamic properties, non-stoichiometry and point defects of HgBa2Ca2Cu3O8+δ. , (), –. doi:10.1088/0953-2048/13/8/309 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research