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Bijlsma, W. R.; Paridaens, D.; Kalmann, R. . (2011). Treatment of severe idiopathic orbital inflammation with intravenous methylprednisolone. British Journal of Ophthalmology, 95(8), 1068–1071. doi:10.1136/bjo.2010.195552 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research