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Mary E. Case and Norman H. Giles. (1971). Partial Enzyme Aggregates Formed by Pleiotropic Mutants in the arom Gene Cluster of Neurospora crassa. Proceedings of the National Academy of Sciences of the United States of America, 68(1), 58–62. doi:10.2307/60781 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research