References
- Maryott A. A., Smith E. B. N.B.S. Circular 514. Department of Commerce, Washington, D. C 1951
- “Merck Index” 8th Ed. Merck & Co., Inc., Rahway, NJ 1968
- “Handbook of Chemistry and Physics” 49th Ed. The Chemical Rubber Co. 1968–69
- Paruta A. N., Sciarrone B. J., Lardi N. G. Jour. Pharm. Sci. 1962; 51: 704