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M. Minovi and V. Minorsky. (1940). Naṣīr al-Dīn Ṭūsī on Finance. Bulletin of the School of Oriental and African Studies, University of London, 10(3), 755–789. doi:10.2307/608840 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research