1. W. Diederen and R. Kadatz, Ärztl. Forsch.24, 149 (1974)
2. M. A. Kimble and R. M. Elenbaas, J. Am. pharm. Ass.14, 362 (1974).
3. Cardiac Glycoside Therapy, in: Evaluations of Drug Interactions, p. 295. American Pharmaceutical Association, Washington, 1973. 1st ed.
4. G. K. Moe and A. E. Farah, in: The Pharmacological Basis of Therapeutics, 5th ed., p. 653, Ed. L. S. Goodman and A. Gilman, Macmillan Publ. Co. Inc, New York 1975.
5. K. Repke, Internist7, 418 (1966).