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Temple F Smith; Chrysanthe Gaitatzes; Kumkum Saxena; Eva J Neer. (1999). The WD repeat: a common architecture for diverse functions. , 24(5), 181–185. doi:10.1016/s0968-0004(99)01384-5 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research