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Roberts, Katherine L.; Summerfield, A. Quentin; Hall, Deborah A. . (2009). Covert auditory spatial orienting: An evaluation of the spatial relevance hypothesis.. Journal of Experimental Psychology: Human Perception and Performance, 35(4), 1178–1191. doi:10.1037/a0014249 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research