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Xiao, X.; Yin, Y.; Bao, J.; Lu, L.; Feng, X. . (2016). Review on the friction and wear of brake materials. Advances in Mechanical Engineering, 8(5), 8/5/1687814016647300–. doi:10.1177/1687814016647300 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research