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Schatz, Michael; Mosen, David M.; Kosinski, Mark; Vollmer, William M.; Magid, David J.; O'Connor, Elizabeth; Zeiger, Robert S. . (2007). The Relationship Between Asthma-Specific Quality of Life and Asthma Control. Journal of Asthma, 44(5), 391–395. doi:10.1080/02770900701364296 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research