1. The Merck Index, 11th edn., Budavari, S., ed., Merck and Co., Inc., Rahway, N.J., p. 14 (1989)
2. Index Noninium: International Drug Directory, compiled by the Scientific Documentation Center of the Swiss Pharmaceutical Society, S. Budavari, ed., Zurich, p. 8 (1987)
3. Clarke’s Isolation and Identification of Drugs in Pharmaceuticals Fluids and Post-Mortem Materials, 2nd edn., A.C. Moffat, ed., The Pharmaceutical Press, London, p. 317 (1986)
4. AHFS Drug Information, G. K. McEvoy, ed., The American Society of Health-System Pharmacists, Maryland, USA, p. 1924 (1995)
5. The United States Pharmacopoeia (USP XX), United State Pharmacopoeial Convention, Inc., Rockville, MD, 20852, p. 1045 (1980)