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Davalos, M.; Frega, N. S.; Saker, B.; Leaf, A. . (1978). Effect of exogenous and endogenous angiotensin II in the isolated perfused rat kidney. American Journal of Physiology-Renal Physiology, 235(6), F605–F610. doi:10.1152/ajprenal.1978.235.6.F605 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research