005700000a22001570004500003000900000005001700009100001900026245009300045562001900138264004900157300000900206041000800215650002400223650004300247700012200290PH-MaWHO20241108112350.0  aHjortsberg, V.  aWHO Collaborating Centre for Chemical Reference Substances : report on the work in 2001.  aEDM/QSM/2002.8  aGeneva : bWorld Health Organization,c2002.  a47p.  aeng  aReference standards  aPharmaceutical preparationsxStandards  aWorld Health Organization. Department of Essential Drugs and Medicines Policy. Quality Assurance and Safety Medicines