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References
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Roberts FF. Fermentation process for the production of citric acid. US Patent 3,717,549 dated Feb 20 1973
Standard Practice for Evaluating Water-Miscible Metalworking Fluid Bioresistance and Antimicrobial Pesticide. West Conshohocken, PA:ASTM International;ASTM Standard Test Method E 2275-03E01.
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