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L.K. McCaul; W.M.M. Jenkins; E.J. Kay. (2001). The reasons for the extraction of various tooth types in Scotland: a 15-year follow up. , 29(6), 0–407. doi:10.1016/s0300-5712(01)00036-7 

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