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de Bildt, A.; Mulder, E. J.; Scheers, T.; Minderaa, R. B.; Tobi, H. . (2006). Pervasive Developmental Disorder, Behavior Problems, and Psychotropic Drug Use in Children and Adolescents With Mental Retardation. PEDIATRICS, 118(6), e1860–e1866. doi:10.1542/peds.2005-3101 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research