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Mou, Tung-Chung; Masada, Nanako; Cooper, Dermot M. F.; Sprang, Stephen R. . (2009). Structural Basis for Inhibition of Mammalian Adenylyl Cyclase by Calcium <sup>†</sup>. Biochemistry, 48(15), 3387–3397. doi:10.1021/bi802122k 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research