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Huiying Wang; Naim H. Al-Said; J.William Lown. (1994). Convenient syntheses of pyrroloiminoquinone and its lexitropsin-linked derivative. , 35(24), 4085–4086. doi:10.1016/s0040-4039(00)73118-2 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research