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Cheng-Ken Ho; Ye-Mon Chen; Chun-i Lin; Jiing-Ruey Jeng. (1990). On the flow of granular material in a model blast furnace. , 63(1), 0–21. doi:10.1016/0032-5910(90)80003-h 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research