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Harradine, Paul; Bevan, Lawrence . (2009). A Review of the Theoretical Unified Approach to Podiatric Biomechanics in Relation to Foot Orthoses Therapy. Journal of the American Podiatric Medical Association, 99(4), 317–325. doi:10.7547/0980317 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research