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S.F. Liu; L.Y. Liu; L.G. Kang. (2008). Refinement role of electromagnetic stirring and strontium in AZ91 magnesium alloy. , 450(1-2), 0–550. doi:10.1016/j.jallcom.2007.07.053 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research