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Aida, Jun; Ando, Yuichi; Akhter, Rahena; Aoyama, Hitoshi; Masui, Mineo; Morita, Manabu . (2006). Reasons for Permanent Tooth Extractions in Japan. Journal of Epidemiology, 16(5), 214–219. doi:10.2188/jea.16.214 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research