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Bolland, M. J.; Wilsher, M. L.; Grey, A.; Horne, A. M.; Fenwick, S.; Gamble, G. D.; Reid, I. R. . (2015). Bone density is normal and does not change over 2 years in sarcoidosis. Osteoporosis International, 26(2), 611–616. doi:10.1007/s00198-014-2870-7 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research