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Paravina, Rade D.; Pérez, Maria M.; Ghinea, Razvan . (2019). Acceptability and perceptibility thresholds in dentistry: A comprehensive review of clinical and research applications. Journal of Esthetic and Restorative Dentistry, (), –. doi:10.1111/jerd.12465 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research