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Manor, Brad; Lipsitz, Lewis A. . (2013). Physiologic complexity and aging: Implications for physical function and rehabilitation. Progress in Neuro-Psychopharmacology and Biological Psychiatry, 45(), 287–293. doi:10.1016/j.pnpbp.2012.08.020 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research