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A. R. Tuktarov; L. L. Khuzina; U. M. Dzhemilev. (2011). Covalent binding of fullerene C60to pharmacologically important compounds. , 60(4), 662–666. doi:10.1007/s11172-011-0102-2 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research