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X. Xiao; L.C. Lev; M.J. Lukitsch. (2009). Material transfer during machining of aluminum alloys with polycrystalline diamond cutting tools. , 209(17), 5760–5765. doi:10.1016/j.jmatprotec.2009.06.006 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research