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HAUNER, H.; SCHMID, P.; PFEIFFER, E. F. . (1987). Glucocorticoids and Insulin Promote the Differentiation of Human Adipocyte Precursor Cells into Fat Cells. The Journal of Clinical Endocrinology & Metabolism, 64(4), 832–835. doi:10.1210/jcem-64-4-832 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research