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Lee, Han A; Lee, Young Hwan; Yoon, Kwon-Ha; Bang, Dong-Ho; Park, Dong Eun . (2016). Comparison of Virtual Unenhanced Images Derived From Dual-Energy CT With True Unenhanced Images in Evaluation of Gallstone Disease. American Journal of Roentgenology, 206(1), 74–80. doi:10.2214/AJR.15.14570 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research