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Bir, Shyamal C.; Shen, Xinggui; Kavanagh, Terrance J.; Kevil, Christopher G.; Pattillo, Christopher B. . (2013). Control of angiogenesis dictated by picomolar superoxide levels. Free Radical Biology and Medicine, 63(), 135–142. doi:10.1016/j.freeradbiomed.2013.05.015 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research