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Holberg, C.; Steinhauser, S.; Rudzki-Janson, I. . (2007). Rapid maxillary expansion in adults: cranial stress reduction depending on the extent of surgery. The European Journal of Orthodontics, 29(1), 31–36. doi:10.1093/ejo/cjl067 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research