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Ebner, R.; Derynck, R. . (1991). Epidermal growth factor and transforming growth factor-alpha: differential intracellular routing and processing of ligand-receptor complexes.. Molecular Biology of the Cell, 2(8), 599–612. doi:10.1091/mbc.2.8.599 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research