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Chirita, G.; Stefanescu, I.; Soares, D.F.; Silva, F.S. . (2010). On the ability of producing FGMs with an AlSi12 aluminium alloy by using centrifugal casting. International Journal of Materials and Product Technology, 39(1/2), 30–. doi:10.1504/ijmpt.2010.034258 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research