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Chai, G.; Forsman, T.; Gustavsson, F.; Wang, C. . (2015). Formation of fine grained area in martensitic steel during very high cycle fatigue. Fatigue & Fracture of Engineering Materials & Structures, 38(11), 1315–1323. doi:10.1111/ffe.12345 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research