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Ji, Shaocheng; Li, Le; Zeng, Wei . (2018). The relationship between diameter and depth of potholes eroded by running water. Journal of Rock Mechanics and Geotechnical Engineering, 10(5), 818–831. doi:10.1016/j.jrmge.2018.05.002 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research