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3. APHA, AWWA, WEF, Standard Methods for the Examination of Water and Wastewater (20th edition), American Public Health Association/American Water Works Association/Water Environment Federation, Washington DC, 1998.
4. USEPA, Method 1602: Male-specific (F+) and Somatic Coliphage in Water by Single Agar Layer (SAL) Procedure, United States Environmental Protection Agency (USEPA), Office of Water, Washington DC, 2001.