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G. Bottini; G. Vallar; S. Cappa; G. C. Monza; E. Scarpini; P. Baron; A. Cheldi; G. Scarlato. (1992). Oxiracetam in dementia: a double-blind, placebo-controlled study. , 86(3), 237–241. doi:10.1111/j.1600-0404.1992.tb05077.x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research