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Tomás Ramón Pintado; Domingo García Pérez De Lema; Howard Van Auken. (2007). Venture Capital in Spain by Stage of Development. , 45(1), 68–88. doi:10.1111/j.1540-627x.2007.00199.x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research