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Beierwaltes, W. H.. (1994). Nitric oxide participates in calcium-mediated regulation of renin release.. Hypertension, 23(1_Suppl), I40–I40. doi:10.1161/01.HYP.23.1_Suppl.I40 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research