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Gui, Nan; Yang, Xingtuan; Tu, Jiyuan; Jiang, Shengyao . (2016). Effect of roundness on the discharge flow of granular particles. Powder Technology, (), S0032591016306416–. doi:10.1016/j.powtec.2016.09.056 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research