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E. Athanasopoulou; S. Maliara-Loulakaki; A. Siafakas. (1990). Study of the frequency, distribution and the generating mechanisms of the alpha rhythm by the method of topographic mapping. , 75(supp-S), 0–. doi:10.1016/0013-4694(90)91735-8 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research