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William A. Peck; Stanley J. Birge Jr.; Junelle Brandt. (1967). Collagen synthesis by isolated bone cells: Stimulation by ascorbic acid in vitro. , 142(2), 0–525. doi:10.1016/0005-2787(67)90632-6 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research