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Mårten Hammar, Zhao Bian and Staffan Normark. (1996). Nucleator-Dependent Intercellular Assembly of Adhesive Curli Organelles in Escherichia coli. Proceedings of the National Academy of Sciences of the United States of America, 93(13), 6562–6566. doi:10.2307/39347 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research