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Marcus, C. L.; Brooks, L. J.; Draper, K. A.; Gozal, D.; Halbower, A. C.; Jones, J.; Schechter, M. S.; Sheldon, S. H.; Spruyt, K.; Ward, S. D.; Lehmann, C.; Shiffman, R. N. . (2012). Diagnosis and Management of Childhood Obstructive Sleep Apnea Syndrome. PEDIATRICS, 130(3), 576–584. doi:10.1542/peds.2012-1671 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research