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Maurizio Mandalà; Natalia Gokina; George Osol. (2002). Contribution of nonendothelial nitric oxide to altered rat uterine resistance artery serotonin reactivity during pregnancy. , 187(2), 463–468. doi:10.1067/mob.2002.123894 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research