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Friedman, Simon H.; DeCamp, Dianne L.; Sijbesma, Rint P.; Srdanov, Gordana; Wudl, Fred; Kenyon, George L.. (1993). Inhibition of the HIV-1 protease by fullerene derivatives: model building studies and experimental verification. , 115(15), 6506–6509. doi:10.1021/ja00068a005 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research