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Srivastava, Kunal; Thakur, Deepika; Sharma, Sheetal; Punekar, Yogesh Suresh . (2015). Systematic Review of Humanistic and Economic Burden of Symptomatic Chronic Obstructive Pulmonary Disease. PharmacoEconomics, 33(5), 467–488. doi:10.1007/s40273-015-0252-4 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research