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Sebastiaan Engelborghs; Karen Maertens; Ellen Vloeberghs; Tony Aerts; Nore Somers; Peter Mariën; Peter P. De Deyn. (2006). Neuropsychological and behavioural correlates of CSF biomarkers in dementia. , 48(4), 0–295. doi:10.1016/j.neuint.2005.11.002 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research