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Nienkemper, Manuel; Wilmes, Benedict; Pauls, Alexander; Drescher, Dieter . (2014). Mini-implant stability at the initial healing period: <i>A clinical pilot study</i>. The Angle Orthodontist, 84(1), 127–133. doi:10.2319/040813-271.1 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research