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Lam, Yu-hong; Houk, K. N. . (2015). Origins of Stereoselectivity in Intramolecular Aldol Reactions Catalyzed by Cinchona Amines. Journal of the American Chemical Society, 137(5), 2116–2127. doi:10.1021/ja513096x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research