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Wu, Wenming; Wu, Qiao; Hong, Xiafei; Xiong, Guangbing; Xiao, Yi; Zhou, Jiaolin; Wang, Wenze; Wu, Huanwen; Zhou, Li; Song, Wei; Dai, Hongmei; Qiu, Huizhong; Zhao, Yupei . (2015). Catechol-O-Methyltransferase Inhibits Colorectal Cancer Cell Proliferation and Invasion. Archives of Medical Research, 46(1), 17–23. doi:10.1016/j.arcmed.2014.12.004 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research