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Zhou, Jiawei; Zhao, Zhicheng; Xue, Yuan; Chang, Wei; Liu, Ping; Han, Sheng; Lin, Hualin . (2017). Regeneration of used rolling oil for sustainable use. Petroleum Science and Technology, 35(16), 1642–1647. doi:10.1080/10916466.2017.1349149 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research