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Kiyokazu Kawada; Wuyunna  ; Toru Nakamura. (2011). Land degradation of abandoned croplands in the Xilingol steppe region, Inner Mongolia, China. , 57(1), 58–64. doi:10.1111/j.1744-697x.2010.00209.x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research