1. European Pharmacopoeia, 6th Ed., Supplement 6.5. Council of Europa, Strasbourg (2009); http: // online6.edqm.eu / ep605 / [now obsolete].
2. State Pharmacopoeia of Ukraine, 1st Ed., Kharkov (2001).
3. State Pharmacopoeia of the Republic of Belarus, Vol. 1, Minsk (2006).
4. State Pharmacopoeia of the Republic of Kazakhstan, 1st Ed., Astana (2008).
5. A. V. Burdein, Vestn. Roszdravnadzora, No. 5, 33–36 (2009).