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Chwalisz, K.; Shao-Qing, S.; Garfield, R. E.; Beier, H. M. . (1997). Cervical ripening in guinea-pigs after a local application of nitric oxide. Human Reproduction, 12(10), 2093–2101. doi:10.1093/humrep/12.10.2093 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research