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Kong, Linggang; Zhang, Minglan; Wei, Xubing; Wang, Yan; Zhang, Guangan; Wu, Zhiguo . (2019). Observation of uniformity of diamond-like carbon coatings utilizing hollow cathode discharges inside metal tubes. Surface and Coatings Technology, 375(), 123–131. doi:10.1016/j.surfcoat.2019.07.024 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research