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Tang, Ming-Kai; Huang, Xing-Jiu; Yu, Jin-Gui; Li, Xue-Wu; Zhang, Qiao-Xin . (2016). The Effect of Textured Surfaces with Different Roughness Structures on the Tribological Properties of Al Alloy. Journal of Materials Engineering and Performance, 25(10), 4115–4125. doi:10.1007/s11665-016-2251-9 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research