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Giovanni E. Salvi; Marco Aglietta; Sigrun Eick; Anton Sculean; Niklaus P. Lang; Christoph A. Ramseier. (2012). Reversibility of experimental peri-implant mucositis compared with experimental gingivitis in humans. , 23(2), 182–190. doi:10.1111/j.1600-0501.2011.02220.x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research