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R. Adell; U Lekholm; B. Rockler; P.-I. Brånemark. (1981). A 15-year study of osseointegrated implants in the treatment of the edentulous jaw. , 10(6), 387–416. doi:10.1016/s0300-9785(81)80077-4 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research