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E. Anne Darragh; Sara E. Zalik. (1988). Synthesis of serum proteins by cultured aggregates from endodermal cells of thearea opacaof the primitive streak chick embryo. , 197(2), 92–100. doi:10.1007/bf00375931 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research