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Lindberg, Nils‐Olof; Pålsson, Magnus; Pihl, Ann‐Christin; Freeman, Reg; Freeman, Tim; Zetzener, Harald; Enstad, Gisle. (2004). Flowability Measurements of Pharmaceutical Powder Mixtures with Poor Flow Using Five Different Techniques. , 30(7), 785–791. doi:10.1081/ddc-120040343 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research