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Alois Haslinger and Michael Karin. (1985). Upstream Promoter Element of the Human Metallothionein-IIAGene Can Act like an Enhancer Element. Proceedings of the National Academy of Sciences of the United States of America, 82(24), 8572–8576. doi:10.2307/26632 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research