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Lu-Chuan Ceng; Hong-Kun Xu; Jen-Chih Yao. (2008). The viscosity approximation method for asymptotically nonexpansive mappings in Banach spaces. , 69(4), 1402–1412. doi:10.1016/j.na.2007.06.040 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research