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M. Weinreb; I. Suponitzky; S. Keila. (1997). Systemic administration of an anabolic dose of PGE2 in young rats increases the osteogenic capacity of bone marrow. , 20(6), 521–526. doi:10.1016/s8756-3282(97)00033-1 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research