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Chehreh Chelgani, S.. (2019). Prediction of specific gravity of Afghan coal based on conventional coal properties by stepwise regression and random forest. Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, (), 1–12. doi:10.1080/15567036.2019.1670288 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research