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Liu, Qi; Wang, Yudai; Zheng, Hang; Tang, Kang; Li, Huaixue; Gong, Shuili . (2016). TC17 titanium alloy laser melting deposition repair process and properties. Optics & Laser Technology, 82(), 1–9. doi:10.1016/j.optlastec.2016.02.013 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research