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3. Vitamin D assay by preventive biological test;Griem;J. Assoc. Off. Agr. Chem.,1937
4. Report on technic and details of biological method, vitamin D carriers;Lachat;J. Assoc. Off. Agr. Chem.,1935
5. A quantitative method for the assay of vitamin D with chickens;Massengale;J. Nut.,1936