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Yong-Feng Cai; Li Li; Meng-Xian Luo; Ke-Fang Yang; Guo-Qiao Lai; Jian-Xiong Jiang; Li-Wen Xu. (2011). Organocatalytic aza-Michael/retro-aza-Michael reaction: Pronounced chirality amplification in aza-Michael reaction and racemization via retro-aza-Michael reaction. , 23(5), 397–403. doi:10.1002/chir.20940 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research