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Zhang, W.; Xia, W. . (2015). The Deashing of High-ash Coking Coal Fines by Flotation. Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 37(7), 714–720. doi:10.1080/15567036.2013.854427 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research