1. Memorandum on the international standard for the gonadotropic substance of urine of pregnancy (chorionic gonadotropin);Bull World Health Org L o N,1939
2. The second international standard for chorionic gonadotropin;Bangham;Bull World Health Org,1964
3. INTERNATIONAL REFERENCE PREPARATION OF HUMAN CHORIONIC GONADOTROPHIN FOR IMMUNOASSAY: POTENCY ESTIMATES IN VARIOUS BIOASSAY AND PROTEIN BINDING ASSAY SYSTEMS; AND INTERNATIONAL REFERENCE PREPARATIONS OF THE α AND β SUBUNITS OF HUMAN CHORIONIC GONADOTROPHIN FOR IMMUNOASSAY
4. A new reference preparation of human chorionic gonadotropin and its subunits;Canfield;Bull World Health Org,1976
5. Preparation and characterization of new WHO reference reagents for human chorionic gonadotropin and metabolites;Birken;Clin Chem,2003