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SPADA, ANNA; VALLAR, LUCIA; GIANNATTASIO, GIULIANA . (1984). Presence of an Adenylate Cyclase Dually Regulated by Somatostatin and Human Pancreatic Growth Hormone (GH)-Releasing Factor in GH-Secreting Cells. Endocrinology, 115(3), 1203–1209. doi:10.1210/endo-115-3-1203 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research