1. Control of Impurities in Substances for Pharmaceutical Use, General chapter 5.10, European Pharmacopoeia, 5th Edn., European Directorate for the Quality of Medicines, Strasbourg, France 2005.
2. General monograph 2034, Substances for Pharmaceutical Use, European Pharmacopoeia, 5th Edn., European Directorate for the Quality of Medicines, Strasbourg, France 2005.
3. Guideline Q3A(R2), Impurities in New Drug Substances, International Conference on Harmonization 2006, http://www.ich.org.
4. Drug impurity profiling strategies*1
5. , , , in: (Ed.), Ullmann's Encyclopedia of Industrial Chemistry, 5th Edn., VCH Verlagsgesellschaft mbH, Weinheim 1985, Vol. A2, pp. 57–97.