DIN 38411-9

German standard methods for the examination of water, waste water and sludge – Microbiological methods (group K) – Part 9: Determination of enterobacterial common antigen (ECA) for the detection of lactose-fermenting enterobacteriaceae (K 9)
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 10/01/2001