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Liu, Xiaoyang; Bai, Zhongke; Zhou, Wei; Cao, Yingui; Zhang, Gengjie . (2017). Changes in soil properties in the soil profile after mining and reclamation in an opencast coal mine on the Loess Plateau, China. Ecological Engineering, 98(), 228–239. doi:10.1016/j.ecoleng.2016.10.078 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research