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S.D. Leary; K.M. Godfrey; L.J. Greenaway; V.A. Davill; C.H.D. Fall. (2003). Contribution of the Umbilical Cord and Membranes to Untrimmed Placental Weight. , 24(2-3), 276–278. doi:10.1053/plac.2002.0888 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research