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Hay, Joe Abdel; Smayra, Tarek; Moussa, Ronald . (2017). Customized polymethylmethacrylate cranioplasty implants using 3D printed polylactic acid molds: Technical note with 2 illustrative cases. World Neurosurgery, (), S1878875017306952–. doi:10.1016/j.wneu.2017.05.007 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research