J. Am. Chem. Soc.,98,(1976),p1920. Crystallography by: G. T. DeTitta, J. W. Edmonds, W. Stallings, J. Donohue

Wolf, B. (1989) Disorders of biotin metabolism. In: The metabolic and molecular bases of inherited disease (Scriver, C. R., beaudet, A. L., Sly, W. S., Valle, D., eds.), 7th edn., pp. 3151-3177, McGraw-Hill Inc., New York.