006570000a22001690004500003000900000005001700009110008200026245018300108562003200291264004900323300001100372041000800383650002900391650002900420650002300449650001500472PH-MaWHO20241108112314.0 aReview Group on Disinfectants and Disinfectant By-Products (1991 : Bethesda). arevision of the WHO guidelines for drinking-water quality : report of the Review Group on Disinfectants and Disinfectant By-Products, Bethesda, Maryland, U.S.A., 10-14 June 1991. aWHO/PEP/91.31.--Unpublished aGeneva : bWorld Health Organization,c1991. a[10]p. aeng aWater qualityxStandards aPotable waterxStandards aWater microbiology aGuidelines