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Cui, Xue-Jun; Liu, Chun-Hai; Yang, Rui-Song; Li, Ming-Tian; Lin, Xiu-Zhou . (2015). Self-sealing micro-arc oxidation coating on AZ91D Mg alloy and its formation mechanism. Surface and Coatings Technology, 269(), 228–237. doi:10.1016/j.surfcoat.2014.09.071 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research