1. British Pharmacopoeia (The Pharmaceutical Press, London 1968), p. 709.
2. United States Pharmacopeia XVI (Mack Publishers Co., Easton, Pennsylvania 1960), p. 517.
3. The Merk Index, 7th edn. (Merck and Co., Inc., Rahway, New Jersey 1960) p. 788.
4. H. A. Kordan, Experientia28, 107 (1972).
5. H. A. Kordan, Z. Pflphysiol.76, 311 (1972).