1. Aggarwal, P., Zutshi, V., and Batra, S., Indian J. Med. Sci., 2008, vol. 62, no. 5, p. 179.
2. The Merck Index: An Encyclopedia of Chemicals, Drugs, and Biologicals, O’Neil, M.J., Heckelman, P.E., Koch, C.B., and Roman, K.J., Eds., Whitehouse Station, NJ: Merck, 2006, 13th ed.
3. Reynolds, J.E.F., Martindale—The Extra Pharmacopoeia, London: Pharmaceutical, 2005, 34th ed, p. 475.
4. The British Pharmacopoeia, London: Her Majesty Stationary Office, 2001, p. 882.
5. Tripathi, K.D., in Essential of Medical Pharmacology, Vij, J.P., Ed., New Delhi: Jaypee Brothers Medical, 2003, 5th ed., p. 7.