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X.A. Domínguez; D. Butruille; A. Zamudio; C.G. Reyes; J.T. Castillo. (1972). Ergosterol et l-mannitol dans des champignons parasites. , 11(8), 2616–0. doi:10.1016/s0031-9422(00)88552-0 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research