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Bruno da Rocha-Azevedo; Gustavo Conde Menezes; Fernando Costa e Silva-Filho. (2006). The interaction between Acanthamoeba polyphaga and human osteoblastic cells in vitro. , 40(1), 0–14. doi:10.1016/j.micpath.2005.09.003 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research