References
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- Yousef R. T. Arznein-Forsch. 1966; 16: 446
- United States Pharmacopoeia, 20th Rev. United States Pharmacopoeial Convention, Rochville 1980
- El-Shattawy H. H. Drug Devel. and Indus. Pharmacy 1982; 8: 617
- Konning G. H., Mital H. C. Pharm. Acta Helv. 1974; 49(5/6)192