1. US Food and Drug Administration 2003 Guidance for Industry, Q3A Impurities in New Drug Substances
2. US Food and Drug Administration 2006 Guidance for Industry, Q3B Impurities in New Drug Products
3. US Food and Drug Administration 1997 Guidance for Industry, Q3C Impurities: Residual Solvents
4. US Food and Drug Administration 2005 Draft Guidance for Industry, ANDAs: Impurities in Drug Substances
5. US Food and Drug Administration 2005 Draft Guidance for Industry, ANDAs: Impurities in Drug Products