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S. R. Hourigan; J. C. Nitz; S. G. Brauer; S. O’Neill; J. Wong; C. A. Richardson. (2008). Positive effects of exercise on falls and fracture risk in osteopenic women. , 19(7), 1077–1086. doi:10.1007/s00198-007-0541-7 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research