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Setsuya Ohba; Johan F.J. Engbersen. (1991). Synthesis of novel amphiphilic diacetylenes with amino or ammonium functionality. , 47(47), 9947–9952. doi:10.1016/s0040-4020(01)80730-4 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research