1. Pharmaceutical counterfeiting
2. WHO. Substandard and Counterfeit Medicines, fact sheet N° 275, November 2003.
3. FDA. Combating Counterfeit Drugs: a Report of the Food and Drug Administration, 2004.
4. WHO. Drug Information, vol. 18, No. 2. 2004.
5. , , , . Counterfeits and Imitations of Viagra and Cialis Tablets: Trends and Risks to Public Health, Rijksinstituut voor Volksgezondheid en Milieu, RIVM report 267041001, 2005.