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Barnet, T.; Whitside, A. . (2003). AIDS in the Twenty-First Century. Enfermedades Infecciosas y Microbiología Clínica, 21(1), 67–. doi:10.1016/S0213-005X(03)72883-3 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research