- ISO 16649-1:2001 : Microbiology of food and animal feeding stuffs. Horizontal method for the enumeration of $Gb-glucuronidase-positive $7IEscherichia coli$7R. Colony-count technique at 44$0DC using membranes and 5-bromo-4- chloro-3-indolyl-$Gb-D-glucuronide

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