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Troosters, T.; Celli, B.; Lystig, T.; Kesten, S.; Mehra, S.; Tashkin, D. P.; Decramer, M. . (2010). Tiotropium as a first maintenance drug in COPD: secondary analysis of the UPLIFT(R) trial. European Respiratory Journal, 36(1), 65–73. doi:10.1183/09031936.00127809 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research