1. Buying prescription drugs on the internet: promises and pitfalls;Weiss;Clev. Clin. J. Med.,2006
2. Magic bullet gone astray: medications and the internet;Veronin;Science,2004
3. European Alliance For Access to Safe Medicines: www.eaasm.eu (last accessed on 5-1-2011).
4. WHO, Sixty-Second World Health Assembly Item 12.9, Counterfeit Medical Products, April 2009. http://aps.who.int/gb/ebhwa/pdf_files/A62/A62_13-en.pdf.
5. B.J. Venhuis, D.M. Barends, M.E. Zwaagstra, D. de Kaste, Recent Developments in Counterfeit and Imitations of Viagra, Cialis and Levitra. RIVM Report 370030001/2007, Bilthoven, 2007.