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M. Ghouri; A. Singh; E. Krishnan; C. Hallman. (2010). An Interesting Case of Mediastinal Paraganglioma in an Elderly Woman. , 158(2), 1–. doi:10.1016/j.jss.2009.11.167 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research