1. European Pharmacopoeia, 3rd edn, Strasbourg, 1997.
2. The United States Pharmacopeia 23, 12601, Twinbrook, Parkway, Rockville, 2000.
3. Farmakopea Polska VI, PTF, Warszawa, 2002.
4. European Pharmacopoeia, 5th edn, Strasbourg, 2004.
5. The United States Pharmacopeia 30, 20852, USP Convention, Rockville, 2007.