1. ISO 9308-3: Water Quality – Detection and Enumeration of Escherichia coli and Coliform Bacteria – Part 3: Miniaturized Method (Most Probable Number) for the Detection and Enumeration of E. coli in Surface and Waste Water;Anon.,1998
2. ISO 7899-1: Water Quality. Detection and Enumeration of Intestinal Enterococci. Part 1: Miniaturized Method (Most Probable Number) for Surface and Waste Water;Anon.,1998
3. ISO 6222: Water Quality. Enumeration of Culturable Micro-organisms. Colony Count by Inoculation in a Nutrient Agar Culture Medium;Anon.,1999
4. Standard methods for the examination of water and wastewater;Anon.,2005
5. Ecological significance and possible risks of nonculturable intestinal bacteria in water systems;Arana,2008