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Slagter, Kirsten W.; Meijer, Henny J.A.; Bakker, Nicolaas A.; Vissink, Arjan; Raghoebar, Gerry M. . (2016). Immediate Single-Tooth Implant Placement in Bony Defects in the Esthetic Zone: A 1-Year Randomized Controlled Trial. Journal of Periodontology, (), 1–15. doi:10.1902/jop.2016.150417 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research