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Xie, Y.; Varshavsky, A. . (2001). RPN4 is a ligand, substrate, and transcriptional regulator of the 26S proteasome: A negative feedback circuit. Proceedings of the National Academy of Sciences, 98(6), 3056–3061. doi:10.1073/pnas.071022298 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research