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El Kaim, Laurent; Grimaud, Laurence; Perroux, Yannick; Tirla, Cornelia . (2003). New Trimethylaluminum-Induced Mannich-Type Reaction of Hydrazones. The Journal of Organic Chemistry, 68(22), 8733–8735. doi:10.1021/jo0352272 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research