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Bicker, U.; Fuhse, P. . (1975). Carcinostatic action of 2-cyanaziridines against a sarcoma in rats. Experimentelle Pathologie, 10(5-6), 279–284. doi:10.1016/S0014-4908(75)80034-2 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research