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Yun, Fan; Cheng, Chunhui; Zhang, Jing; Li, Jingxuan; Liu, Xia; Xie, Rui; Tang, Pingwah; Yuan, Qipeng . (2016). Boric Acid Catalyzed Direct Amidation between Amino-Azaarenes and Carboxylic Acids. Synthesis, 49(7), 1583–1596. doi:10.1055/s-0036-1588126 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research