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Okruhlik, Kathleen; Brown, James Robert . (1985). The Natural Philosophy of Leibniz || Leibniz and Kant on Mathematical and Philosophical Knowledge. , 10.1007/978-94-009-5490-8(Chapter 9), 227–261. doi:10.1007/978-94-009-5490-8_9 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research