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Zhou, Y.-X.; Zhao, M.; Li, D.; Shimazu, K.; Sakata, K.; Deng, C.-X.; Lu, B. . (2003). Cerebellar Deficits and Hyperactivity in Mice Lacking Smad4. Journal of Biological Chemistry, 278(43), 42313–42320. doi:10.1074/jbc.M308287200 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research