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El Askary, Abdel Salam; Meffert, Roland M.; Griffin, Terrence . (1999).
Why Do Dental Implants Fail? Part I. Implant Dentistry, 8(2), 173–185.
doi:10.1097/00008505-199902000-00011
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research
