1. International Conference on Harmonisation Guideline on Stability Testing of New Drug Substances and Products, Q1A (R2), 2003.
2. International Conference on Harmonisation Guideline on Photostability Testing of New Drug Substances and Products, Q1B, 1996.
3. International Conference on Harmonisation Guideline on Impurities in New Drug Products, Q3B (R2), 2006.
4. The Merck Index, Merck & Co., Inc., Whitehouse Station, NJ, USA, 2006, 14:587.