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Donald Metcalf. (1998). Lineage Commitment in the Progeny of Murine Hematopoietic Preprogenitor Cells: Influence of Thrombopoietin and Interleukin 5. Proceedings of the National Academy of Sciences of the United States of America, 95(11), 6408–6412. doi:10.2307/45393 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research