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Haj Mohammad Jafar, R.; Spelt, J.K.; Papini, M. . (2013). Surface roughness and erosion rate of abrasive jet micro-machined channels: Experiments and analytical model. Wear, 303(1-2), 138–145. doi:10.1016/j.wear.2013.03.005 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research