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Howard-Alpe, G. M.; de Bono, J.; Hudsmith, L.; Orr, W. P.; Foex, P.; Sear, J. W. . (2007). Coronary artery stents and non-cardiac surgery. British Journal of Anaesthesia, 98(5), 560–574. doi:10.1093/bja/aem089 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research