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Havlica, J.; Jirounkova, K.; Travnickova, T.; Stanovsky, P.; Petrus, P.; Kohout, M. . (2019). Granular dynamics in a vertical bladed mixer: Secondary flow patterns. Powder Technology, 344(), 79–88. doi:10.1016/j.powtec.2018.11.094 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research