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W. Banks; C. T. Greenwood. (1969). Studies on Starch-Degrading Enzymes Part XI. The Stability of Crystalline Sweet Potato Beta-Amylase in Aqueous Solution. , 21(7), 177–180. doi:10.1002/star.19690210703 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research