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Giersberg, M. F.; Hartung, J.; Kemper, N.; Spindler, B. . (2016). Floor space covered by broiler chickens kept at stocking densities according to Council Directive 2007/43/EC. Veterinary Record, 179(5), 124–124. doi:10.1136/vr.103563 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research