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Sam Zhang; Deen Sun; Yongqing Fu; Hejun Du. (2003). Recent advances of superhard nanocomposite coatings: a review. , 167(2-3), 113–119. doi:10.1016/s0257-8972(02)00903-9 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research