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Reeves, TE; Mah, P; McDavid, WD . (2012). Deriving Hounsfield units using grey levels in cone beam CT: a clinical application. Dentomaxillofacial Radiology, 41(6), 500–508. doi:10.1259/dmfr/31640433 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research