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Zhou, Qi; Zhao, Hong Liang; Song, En Jun; Chen, Xiu Lian . (2011). Sol-Gel Films Prepared with Pure Alumina Sol by Re-Dissolution on Aluminum Alloy. Advanced Materials Research, 382(), 332–335. doi:10.4028/www.scientific.net/AMR.382.332 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research