006420000a22001810004500003000900000005001700009110007200026245012900098020001800227264004900245490004000294300001000334041000800344650003500352650002700387650001600414700003000430PH-MaWHO20241108112333.0 aWHO Expert Committee on Biological Standardization (1967 : Geneva). aWHO Expert Committee on Biological Standardization [meeting held in Geneva from 25 to 30 September 1967] : twentieth report. a92-4-120384-6 aGeneva : bWorld Health Organization,c1968. a(WHO technical report series ; 384) a100p. aeng aBiological productsxStandards aAntibioticsxStandards aImmune sera aWorld Health Organization