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Porter, Jared M; Partridge, Julie A; Brooks, Toby . (2010). Directing Attentional Focus Does Not Influence Standing Broad Jump Performance. Journal of Strength and Conditioning Research, 24(), 1–. doi:10.1097/01.jsc.0000367197.57172.82 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research