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J. Engel; S. Ahlenius; O. Almgren; A. Carlsson; K. Larsson; P. Södersten. (1979). Effects of gonadectomy and hormone replacement on brain monoamine synthesis in male rats. , 10(1), 149–154. doi:10.1016/0091-3057(79)90181-3 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research