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Dai, Houfu; Chen, Jingjing; Liu, Guojie . (2019). A numerical study on subsurface quality and material removal during ultrasonic vibration assisted cutting of monocrystalline silicon by molecular dynamics simulation. Materials Research Express, 6(6), 065908–. doi:10.1088/2053-1591/ab0ccb 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research