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Z. Leah Harris, Alison P. Durley, Tsz Kwong Man and Jonathan D. Gitlin. (1999). Targeted Gene Disruption Reveals an Essential Role for Ceruloplasmin in Cellular Iron Efflux. Proceedings of the National Academy of Sciences of the United States of America, 96(19), 10812–10817. doi:10.2307/48835 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research