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Franka Stahl; Tiziano Baccetti; Lorenzo Franchi; James A. McNamara Jr. (2008). Longitudinal growth changes in untreated subjects with Class II Division 1 malocclusion. , 134(1), 125–137. doi:10.1016/j.ajodo.2006.06.028 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research