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Han, Ruiping; Hagos, Kiros; Ji, Xiaoyan; Zhang, Shaopeng; Chen, Jingjing; Yang, Zhuhong; Lu, Xiaohua; Wang, Changsong . (2016). Review on heat-utilization processes and heat-exchange equipment in biogas engineering. Journal of Renewable and Sustainable Energy, 8(3), 032701–. doi:10.1063/1.4949497 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research