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Buschhorn, Holly M.; Strout, Tania D.; Sholl, J. Matthew; Baumann, Michael R. . (2013). Emergency Medical Services Triage Using the Emergency Severity Index: Is it Reliable and Valid?. Journal of Emergency Nursing, 39(5), e55–e63. doi:10.1016/j.jen.2011.11.003 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research