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Zhang, Qingchun; Goetze, Andrew M.; Cui, Huanchun; Wylie, Jenna; Tillotson, Ben; Hewig, Art; Hall, Michael P.; Flynn, Gregory C. . (2016). Characterization of the co-elution of host cell proteins with monoclonal antibodies during protein A purification. Biotechnology Progress, 32(3), 708–717. doi:10.1002/btpr.2272 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research