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Ansari, Aslam M.; Ugwu, Sydney O. . (2008). Efficient Synthesis of α-Substituted Amino Acid Ester: Alkylation and Hydrogenation Removal of Schiff's Base Protecting Group. Synthetic Communications, 38(14), 2330–2340. doi:10.1080/00397910802138611 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research