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Bayer, Otto. (1979). Chinone (Teil 3: Anthrachinone, Anthrone) || II. Oxidative Umwandlung der 10-Anthrone. , 10.1055/b-003-109672(), –. doi:10.1055/b-0035-110590 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research