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Hürzeler, Markus B; von Mohrenschildt, Sebastian; Zuhr, Otto. (2010). Stage-two implant surgery in the esthetic zone: a new technique.. The International journal of periodontics & restorative dentistry, 30(2), 187–193. doi:10.0000/PMID20228978 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research