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Giuseppe Polimeni; Andreas V. Xiropaidis; Ulf M. E. Wikesjö. (2006). Biology and principles of periodontal wound healing/regeneration. , 41(1), 30–47. doi:10.1111/j.1600-0757.2006.00157.x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research